It is a waste of time going to the doctor with most mild complaints.

为了种种小毛病去看医生是浪费时间。

《柯林斯英汉双解大词典》

He thinks doing housework is a waste of time.

他认为做家务是浪费时间。

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Killing time is the main reason for me to watch the short videos, but many are almost the same, so I think it is a waste of time.

对我来说，看短视频的主要原因是消磨时间，但它们大多数几乎都一样，所以我觉得这是浪费时间。

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In addition,news agencies provide updates and companies share product information through Twitter Some critics say Twitter is a waste of time that takes people's attention away from their work.

VOA: special.2009.02.06

And I am not going to take the time to solve it because I think that is a waste of class time, but those are the three unknowns.

但我并不打算把解这几个方程,我觉得那会是浪费课堂时间，但那是三个未知式。

麻省理工公开课 - 固态化学导论课程节选

I can't help thinking this is a complete waste of time.

我忍不住在想，这完全是在浪费时间。

I can't help but 实战 - SpeakingMax英语口语达人

He thinks all the fretting about the American economy is a waste of time.

NPR: Au Contraire, Economics

"I like nice things, but going to most stores is a waste of time, " he says.

FORBES: Magazine Article

Of course there are plenty of times when talking is a waste of time.

MSN: Talk Is Cheap, but Sometimes It's Worth More Than Text