It's a waste of time and energy.

那是浪费时间和精力。

《牛津词典》

In my view it was a waste of time.

依我看，这是浪费时间。

《牛津词典》

"It's a waste of time," he concluded.

“这是浪费时间，”他最后说道。

《柯林斯英汉双解大词典》

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

I think it's terribly important to keep the distinction in the back of our minds even if we find it, in practical terms, well nigh impossible and possibly even in many contexts a waste of time to be perpetually enforcing it.

你们一定要牢记这个区别,这实在是太重要了，尽管有时我们发现在一些的文本中这种区别很微小,看上去不值得花时间去研究或使用。

耶鲁公开课 - 文学理论导论课程节选

The last one that we saw was a complete waste of time.

我们看的上一部这种电影完全是浪费时间。

There is no 实战 - SpeakingMax英语口语达人

To call a business plan a waste of time seems a bit heavy handed.

FORBES: Why Business Plans Don't Work And 'Pivoting' Is Nonsense

The Liberal Democrats also criticised the proposed trials as "a waste of time and money".

BBC: NEWS | UK | Politics | ID cards 'cannot stop terrorism'

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

NPR: Au Contraire, Economics