And one last expression, one that means do not worry or work too hard.

VOA: special.2009.06.07

He constantly warns his son, who was kind of an n'er do well, that, "You better work hard, " Or, "You better work a little harder and pay more attention to what you're doing.

他不断提醒那一事无成的儿子,"你要加倍用功,哪怕只是稍微用点心,对你做的事要更上心

耶鲁公开课 - 欧洲文明课程节选

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

(OMITTED) Students work as hard in class as they do on the basketball court, and Taylor says they are succeeding.

VOA: standard.2010.06.24

Do it. You know, work hard.

要行动。我的意思是，要埋头苦干。

如果是在考虑留学 - SpeakingMax英语口语达人

"We are working hard toward an agreement. It is clear we have the major elements of an agreement in place and now we have to do the hard work of conforming the treaty and some other small negotiations,".

VOA: standard.2010.02.03

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