你必须努力工作。

You must work hard.

youdao

为了要成功，你必须努力工作。

You must work hard in order to succeed.

youdao

你必须努力工作，才能在以后的工作中成功。

You must work hard, then you’ll be successful in future.

youdao

Now it could be that you're hungry but you're working hard, and so you may not get your food for an hour until after you're hungry.

现在你很饿,但是你必须努力工作,直到一小时后才能吃东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选