成语 up to you (to ...)
(按语境)相等于
yours (to ...)
your job (to ...)
your decision (to ...)
即
需要你来(做/处理/...)
由你来(做/决定/...)
例:
It is up to you to clean up the mess you made.
= The mess you made is yours to clean up.
你的烂摊子需要由你来清理。
Whether you go by train or by bus is up to you.
= Whether you go by train or by bus is your decision.
乘火车或乘公交车是由你决定。
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