keep off 避开;不让…接近
keep on 继续进行，反复地做
keep out of 躲开，(使)置身…之外
keep to 坚持;固守(习惯等)
keep to oneself 保守秘密，不与人来往
keep under 压制;控制
keep up 继续;坚持，维持
keep up with 跟上，不落后
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