A better definition of recession, surely, is a fall in average income per person.
当然，对于衰退的定义便是，人均收入的下降。
If I look at the definition of the center of mass, it's the average value of x.
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.
由质心的定义可知，它就是x的平均值。
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