不要在家常琐事上浪费时间。

Don't waste time on domestic trivialities.

《新英汉大辞典》

不要在健脑的计算机程序上花费时间了。

Don't waste your time with brain fitness computer programs.

youdao

作听力练习要重材料大意， 而不要力求听懂每个词，不要在单个词上浪费太多时间。

D. Catching the drift of the content instead of understanding every word and never waste too much time on single words.

youdao

You'd better care about military things more than you do.

多花点时间在军政大事上,不要成天四处游荡

耶鲁公开课 - 欧洲文明课程节选