waste sth in doing sth 什么意思还有waste sth on sth

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waste sth in doing sth 什么意思
还有waste sth on sth

waste sth in doing sth:把……浪费在做某事上.
waste sth on sth:意思同上.
例:Don't waste time (in) doing those silly things.别花时间做这些傻事了.
可以把in doing换成on:Don't waste time on those silly things.