exercise不可数(v.):身体锻炼 I take exercise every day.
physical or mental activity that you do to stay healthy or become stronger
exercises可数:具体的锻炼操,习题练习
eye exercises, English exercises
practice操练(不可数,v.):强调反复性,熟练 Practice makes perfect.
doing an activity or training regularly so that you can improve your skill.
初中阶段(略):practice可数的用法,一个常规做法,具体练习,医生/律师专业活动
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