由定义可知，它们非常难以预测。
由质心的定义可知，它就是x的平均值。
If I look at the definition of the center of mass, it's the average value of x.
由声学的基本原理可知：产生噪声的根本原因是振动。
Due to the basic theory of acoustics:the fundamentality reason of noise is vibrate.
由实验结果可知钎料凸台可以提供足够的剪切强度。
It is shown that the bumps can supply sufficient shear strength for use.
细节理解题，由文中最后一段最后一句话可知。
由文章的标题和副标题可知，本文讲的是怎样带领一个团队取得成功。
A How to become a best player in your team. B How to become successful in business. C How to lead your team to achieve success.
由短文的最后一句，可知这座城市将为和别人共用车辆的人们建造快车道。
You should have your car shared with somebody else and drive along the fast lane.
由句意可知，anthropology就是“研究人类的科学”。
由句意可知，anthropology就是“研究人类的科学”。
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