即平均变化。
The average person can expect to change careers several times in his or her lifetime.
每人一生平均都要换几次工作。
Contrasted with average temperature, the change of extreme temperature is more unsteadily.
极端温度的变化较之于平均温度更趋不稳定。
Over the 20-year period, the average height of men did not change.
在此20年期间，男性平均身高没有变化。
Over the 20-year period, the average height of men did not change.
在此20年期间，男性平均身高没有变化。
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