I think he should spend time on more meaningful things, such as exercising or reading.

我认为他应该把时间花在更有意义的事情上，比如锻炼或阅读。

youdao

You should spend time on basic training, not on those flourishes.

要练好基本功， 别尽学花架子。

《新英汉大辞典》

Don't spend time on market research.

不要在市场调上研花过多时间。

youdao

For many Americans, summer is a time to put on swim wear and spend time at the sea or a lake.

VOA: special.2010.06.08

Last week, you'll be writing your second paper and I'd rather spend time on that than doing any outside reading.

最后一周，你们会写第二篇论文,我宁愿花时间在那上面,而不愿做一些课外阅读。

麻省理工公开课 - 电影哲学课程节选

To answer the question what is Biomedical Engineering, we're going to spend time on that today and we'll spend time on Thursday, and I want to approach it from a couple of different angles.

我在今天和周四课上,来回答,生物医学工程是什么,我会从一系列不同的角度来带你们入门

耶鲁公开课 - 生物医学工程探索课程节选

She plans to go to South Korea and spend time on a resort island there.

WSJ: A Popular Side Trip for Foreigners in China: Visa Runs

If you spend time on screws, some competitor will score a hit with a cooler handset.

FORBES: Ghost cars, ghost brands

They could let data escape, or spend time on personal letters and spreadsheets.

FORBES: Facebook: Why businesses need to use it - and its new email client