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9 Principles of sound 声学原理 The abilities of speaking and hearing are very important factors in our personal lives and in our environment. Areas such as
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الجوافة Guava الاسم العلمي Psidium guajava L. العائلة الآسية Myrtaceae الموطن الأصلي هو المنطقة الاستوائية من أمريكا
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