一封电子邮件的风格转换，从轻松活泼到异常正式，可能预示有不法行为的迹象。
shift in an author's e-mail style, from breezy to unusually formal, can raise a red flag about illegal activity.
我不在乎孩子们活泼好动，但我在乎他们的粗鲁行为。
身体失水对蝌蚪的行为性会产生一定的影响，蝌蚪的活泼性随时间的延长而降低。
Water loss in body could seriously influenced the activity, and the activity decreased with the increase of time.
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