exercise是指运动,exercises是指练习,比如数学练习题：math exercises,practice后面加doing,是指练习做一件事,而exercises前面加形容词,activities是指活动（复数）.
总之其他区别很明显,只是加不加s而带来的深层意义,更要注意两个词之间的联系和其后所加的...=w=
如何区分exercise,exercises,practice,activities,activity?
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