It's a hard work, so you must work hard.

这是一件艰苦的工作，因此你必须努力去做。

youdao

It will be hard to work today—specially when it's so warm and sunny outside.

今天无心工作—尤其是外面这样风和日丽。

《牛津词典》

To master a foreign language like English requires hard work, so you can't study too hard.

掌握一门像英语这样的外语需要勤奋学习，因此你再怎么努力也不为过。

youdao

"There are so many people who work so hard everyday but they can't realize the benefits of that hard work to the extent that they should."

VOA: standard.2009.11.03

This is the remarkable thing about so many of Milton's similes: they're always bursting out of whatever critical or theological constraints that we work so hard to impose on them.

这是弥尔顿的比喻中的亮点：,它们总是能从我们强加的,无论多批判多神学的束缚中,挣脱出来。

耶鲁公开课 - 弥尔顿课程节选

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

So why do liberals work so hard to create the perception that "taxing the rich" will solve our problems even though the top 10% of taxpayers already pay 70% of all federal income taxes and many low-income Americans pay no federal taxes at all?

CNN: Why America needs a tax reformation

"We are all young and want to succeed, so we work hard together as a team and that is where our strength lies".

BBC: Pienaar praises Koeman

The Wall Street Crash was a product of an economy in deep depression - so governments work hard to prevent such problems happening again.

BBC: A fateful day for investors