waste time on

基本解释

But why waste time on trifles.
为什么要在琐事上浪费时间。
Don't waste time on domestic trivialities.
不要在家常琐事上浪费时间。
《新英汉大辞典》
It can prompt managers to waste time on the wrong issues by, for example, addressing weaknesses that are unimportant in their current roles.
它也可能导致经理人在错误的问题上浪费时间，例如，处理他们这一角色中的并不重要的弱点。
chunfengqiushui.blog.tianya.cn

But where can you hope to find a widow who would waste her time on a marriage proposal that has no marriage in it?"
I stress it in particular because I know you're all going to get into this stage; you've got a problem set due in a couple of hours, you're still writing the code, you don't want to waste time, and I'm going to use quotes on "waste time", doing those extra things to do the defensive programming, you just want to get the darn thing done.
我特别强调了这一点,因为我知道你们都会慢慢成为程序员;,你在写代码过程中造成了一系列的错误，你还在写代码，你不想浪费时间，我想把“浪费时间“用引号圈起来，浪费时间来做因为防卫性程序设计，而带来的这些额外的事情,你只想赶紧把程序写完，这不是一个好习惯，因为当你做完回头。
麻省理工公开课 - 计算机科学及编程导论课程节选

There will be no need to send email attachments, go door-to-door, or waste time on the phone.
FORBES: The Biggest Threat To Venture Capitalists
They do not expect Congress to waste time on politically motivated fishing expeditions, which this has clearly become.
WHITEHOUSE: Press Briefing