They grumble about how hard they have to work.

他们抱怨自己工作得很辛苦。

《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》

She doesn't have to work at weekends.

她周末不用上班。

《牛津词典》

You really have to work at it." Junior Achievement says three hundred eighty-five thousand volunteers support its programs around the world.

VOA: special.2009.11.27

So that, to think nothing is something you have to work at; it's something that you can be preoccupied with.

所以脑子里一片空白,也是需要你努力的事;,需要全神贯注的事。

耶鲁公开课 - 1945年后的美国小说课程节选

I thought I still have to work for another 30, 40 years. I need to do something else.

我原本想，我还必须工作三四十年。但我需要做点别的事情。

怡人的的汉普斯特德 - SpeakingMax英语口语达人

But for that to happen, it means that Democrats and Republicans have to work together.

WHITEHOUSE: Weekly Address: A Bipartisan Approach to Strengthening the Economy | The White House

As he explained, he was grateful but he would then have to work harder and longer hours.

FORBES: Asian Beauty

So you have to work real hard to keep your clients from leaving you.

FORBES: International Campaign to Eliminate Pension Consultant Abuses (November 2, 2004 )