The mechanics work hard to keep the helicopters airworthy.

机修工们为了保障直升机的适航性而努力工作着。

《柯林斯英汉双解大词典》

I have to work hard today.

今天我得努力工作。

《牛津词典》

You need to work hard to keep ahead.

你要努力才能保持领先优势。

《牛津词典》

But first,we talk to some Americans who have retired from their professional lives but still work hard to help others.

VOA: special.2010.07.16

They're efficient enough that you have to work hard to find opportunities, but not perfectly.

如果你付出足够的努力,还是能发现机会,所以市场并不完全有效

耶鲁公开课 - 金融市场课程节选

and just, you know, work hard and study, do your homework, eat well too, I'm sure that helps

所以，我的建议是，努力学习，认真完成作业，
同时也好好吃饭，这真的很重要哦。

如果是在考虑留学 - SpeakingMax英语口语达人

Mr Paes promised to "work hard and treat the citizens with a lot of respect".

BBC: Eduardo Paes re-elected as Rio de Janeiro mayor

Hoddy, who turned 100 last year, recalls, K.P. wasn t afraid to work hard.

FORBES: Pay Dirt

Men feel they can be neither of these and they work hard to establish self esteem.

FORBES: Readers Say