Lesson Plan

• Review

• New Words and Phrases

• Reading and Translating—Unit Sixteen

• Classroom Exercises

Review

Unit Sixteen Modern Road

单 元 16现代化道路

The efficiency of a country’s road network has a profound effect on its prosperity. The ability of roads to enable traffic to flow freely and safely between the industrial and commercial centers contributes enormously towards a progressive economy. In fact, the importance of good roads, both nationally and internationally, cannot be overstressed.

The efficiency of a country’s road network has a profound effect on its prosperity. The ability of roads to enable traffic to flow freely and safely between the industrial and commercial centers contributes enormously towards a progressive economy. In fact, the importance of good roads, both nationally and internationally, cannot be overstressed.

发达的交通系统对一个国家的繁荣有着深刻的影响。道路若能使得工业中心与商业中心间的交通变得畅通无阻、安全可靠，将极大地促进经济的发展。事实上，无论是对一个国家还是对全世界来说，优质道路的重要性无论怎样强调都不为过。

In order to serve their purpose to the best advantage, modern roads should, as far as possible, possess the following principal features:

(a) They should be designed according to the anticipated volume and speed of the traffic likely to use them.

In order to serve their purpose to the best advantage, modern roads should, as far as possible, possess the following principal features:

(a) They should be designed according to the anticipated volume and speed of the traffic likely to use them.

为了充分发挥作用，现代道路应当尽可能具备下列主要特征：

(a) 应按照预计的车流量和车速进行设计；

(b) Bends and gradients, where necessary, should always be slight.

(c) Visibility should be unimpeded.

(d) They should be well and clearly signposted.

(e) Adequate provision should be made for both cyclists and pedestrians, having due regard for their safety.

(f) They should be well lit, where necessary.

(b) Bends and gradients, where necessary, should always be slight.

(c) Visibility should be unimpeded.

(d) They should be well and clearly signposted.

(e) Adequate provision should be made for both cyclists and pedestrians, having due regard for their safety.

(f) They should be well lit, where necessary.• 弯度和坡度不可避免时，要尽可能平缓；• 能见度要好；• 路标设置完备醒目；• 充分考虑非机动车辆和行人的安全，他们的安全应受

到足够的尊重；• 需要照明时，光线充足；

(g) Landscaping and hedge and tree planting on the sides and central reservations should be arranged to provide a pleasant and interesting outlook for the road users, to avoid monotony and boredom.

(g) Landscaping and hedge and tree planting on the sides and central reservations should be arranged to provide a pleasant and interesting outlook for the road users, to avoid monotony and boredom.

为了避免单调、乏味，给使用者提供一个赏心悦目的环境，道路两侧要进行美化，设置栅栏，种植树木，路中心要设置分隔带。

The first step in building a road is to plan the route. Sometimes the route has been decided by the nature of the land, but today nature can often be conquered. With powerful modern machinery, whole mountains can be removed and valleys filled in to make the route as direct as possible.

The first step in building a road is to plan the route. Sometimes the route has been decided by the nature of the land, but today nature can often be conquered. With powerful modern machinery, whole mountains can be removed and valleys filled in to make the route as direct as possible.

筑路的第一步是规划线路。有时线路规划受制于场地的天然状态，不过现在大自然往往可以改造。由于大功率的现代化机械的采用，整座山可以移走，河谷可以填平，道路因此可以尽量取直。

Then the details are planned: the width of the highway, the number of driving lanes, the number and location of entrances and exits, and how strong the road must be. All these depend on the amount of traffic that is expected. Modern roads are usually planned for the next 20years traffic.

Then the details are planned: the width of the highway, the number of driving lanes, the number and location of entrances and exits, and how strong the road must be. All these depend on the amount of traffic that is expected. Modern roads are usually planned for the next 20years traffic.

然后，进行分项设计：公路宽度、行车车道数目、入口和出口的数目、位置以及道路必须具有的强度。所有这些都取决于预期的交通量。现代化的道路一般按承受 20 年的交通运输量的标准而规划。

The next step is the testing of the earth foundation on which the road is to rest. Engineers carefully study the soil to learn how solid it is ， how much moisture it contains and how well it drains. Then they decide how the soil should be prepared and packed to provide a good, sturdy foundation ， or roadbed.

The next step is the testing of the earth foundation on which the road is to rest. Engineers carefully study the soil to learn how solid it is ， how much moisture it contains and how well it drains. Then they decide how the soil should be prepared and packed to provide a good, sturdy foundation ， or roadbed.

下一步骤是测试将要铺路的土壤基础，工程师们要仔细研究土壤，以便了解密实程度如 何，含水量多少，排水情况好不好，然后他们决定土壤应如何处理，如何压实，以保证有一良好而坚固的基础（即路基）。

They prescribe the thickness of the road layers, the size of the rocks in them, and the other materials that should be used. While the testing is under way, a group of surveyors begins to measure the land to find out exactly how much work needs to be done and how much it will cost. Then the construction crew can finally move in.

They prescribe the thickness of the road layers, the size of the rocks in them, and the other materials that should be used. While the testing is under way, a group of surveyors begins to measure the land to find out exactly how much work needs to be done and how much it will cost. Then the construction crew can finally move in.

他们需定出道路各层的厚度，各路层使用石块的块径及所使用的其他材料。在试验进行的同时，测量组开始测量土地，以便精确算出需要多大的施工量以及造价。之后，施工人员即可进入工地。

Proper drainage is essential in road building, because if the foundation became soggy, the heavy road would sink into it. And if the water were to freeze in the ground, it would expand and crack the road. To protect the highway from such damage, drainpipes called culverts are laid across the roadbed wherever a strong flow of water is expected.

Proper drainage is essential in road building, because if the foundation became soggy, the heavy road would sink into it. And if the water were to freeze in the ground, it would expand and crack the road. To protect the highway from such damage, drainpipes called culverts are laid across the roadbed wherever a strong flow of water is expected.

在道路建设中，正常排水必不可少，因为如果基础浸泡后，很重的道路面会下陷。如果水在地表内结冰，会使路面开裂。为使公路免遭这类损坏，在预计出现强水流的地方，横穿路基铺设叫做“涵洞”的排水管。

The roadbed itself is shaped so that the middle of the finished road will be higher than the sides. Then water and melting snow will easily drain off its surface into the drainpipes or ditches. The roadbed is given a final grading (smoothing) and is now ready to receive the road itself.

The roadbed itself is shaped so that the middle of the finished road will be higher than the sides. Then water and melting snow will easily drain off its surface into the drainpipes or ditches. The roadbed is given a final grading (smoothing) and is now ready to receive the road itself.

路基要整形，以使铺好的路面中间高于两侧，从而水和融雪就会很容易地从路面流到排水管或排水沟内。路基做完最后找坡（找平），即为铺路做好准备。

Almost all roads are built in two or more layers, of rocks or stones. The bottom layer is 10 to 20 centimeters thick and usually made up of larger stones. The upper course has smaller stones and is about 8 centimeters thick. In most roads the lower course is wide so that the edges, or shoulders, of the top course do not break off or sink into soft dirt. After each course is laid, it is compacted by heavy power rollers.

Almost all roads are built in two or more layers, of rocks or stones. The bottom layer is 10 to 20 centimeters thick and usually made up of larger stones. The upper course has smaller stones and is about 8 centimeters thick. In most roads the lower course is wide so that the edges, or shoulders, of the top course do not break off or sink into soft dirt. After each course is laid, it is compacted by heavy power rollers.

几乎所有的道路都是铺设 2层或 2层以上的石头。底层 10～ 20厘米厚，通常由较大的石头铺成。上层用较小的石头，约 8厘米厚。大多数的道路，下一层比较宽，以使顶层的边缘，即路肩不会断裂或下沉到松软的泥土中。各层铺好后，用大功率压路机压实。

Classroom Exercises The top or surface layer of a road must

withstand the weight of heavy vehicles. It must also prevent water from seeping into the roadbed. And modern highways are therefore surfaced either with concrete or with bituminous materials, such as asphalt, tar, or heavy oils.