But he is hard at work. He and his team currently are trying to make algae that can change carbon dioxide back into fossil fuel.

VOA: special.2010.07.20

I mean, they have no idea how hard we work, and look at this gigantic split infinitive, to dramatically help.

他们不知道我们有多么努力地工作，注意到这之间的巨大鸿沟，会有很大的帮助。

麻省理工公开课 - 固态化学导论课程节选

And so, just a lot of hard work and a lot of time at the golf course in the summer.

所以，夏天时，一直努力练习，在高尔夫球场花了不少时间。

高尔夫俱乐部的回忆 - SpeakingMax英语口语达人

William Thornton is hard at work on a set of building drawings.

VOA: special.2010.01.27

Well... people at Harvard don't work as hard academically.

我想……哈佛的学生在学术方面没有那么刻苦。

来普林斯顿吧 - SpeakingMax英语口语达人

These paintings show Americans hard at work in different industries.

VOA: special.2009.01.02

Many students work hard at summer jobs.

VOA: special.2010.06.18

The young people here are hard at play, and the Muslim elders are hard at work trying to keep them engaged in positive activities.

VOA: standard.2009.12.20

He says he learned playing basketball at Princeton University that both take hard work and perseverance.

VOA: standard.2010.06.24

"I think they have to have an example like some stars like Landon Donovan on the US national team of the World Cup so they can see what an example is and what they could be like when they grow up and work hard at football."

VOA: standard.2010.06.15