Yet molecules are always moving, some perhaps as fast as a mile per second.
分子仍然总在行为，其中有些分子的行为速度磁缦憧秒一英里。
Mongolia is the second least populated country with just 4.2 people per square mile.
蒙古是只有4.2秒，每平方英里人口最少的国家的人民。
Mongolia is the second least populated country with just 4.2 people per square mile.
蒙古是只有4.2秒，每平方英里人口最少的国家的人民。
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