He's hard at work on a new novel.

他正努力忙着写一本新小说。

《牛津词典》

But in recent years I've been hard at work on a still more ambitious project-called Wolfram | Alpha.

其实，我最近数年一直在努力进行的是一个更加雄心勃勃的项目——名叫Wolfram | Alpha。

youdao

I was hard at work on a term papers when my baby sister bounded up the stairs and burst into my room.

我正在努力地写学期论文，可是我的小妹妹却不断冲进我的房间打扰我。

youdao

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

VOA: special.2010.01.27

So if we can get better at giving people triggers of when to leave early, which we will work very hard on doing, then people evacuating themselves is the safest thing to do as long as it's early enough."

VOA: standard.2009.06.24

He's already hard at work on his next novel, also set in the criminal underworld.

CNN: 'Angel Baby' author prefers grime to crime

In addition to Minecraft, Mojang is also hard at work on its next game, Scrolls.

FORBES: Move up http://i.forbesimg.com t Move down

But I can tell you that he is hard at work on his memoirs.

CENTERFORSECURITYPOLICY: Liz Cheney at the Freedom Flame: Educating Obama