You must screw up your courage.

你必须鼓起勇气。

Don't stand there-screw up your courage and jump.

别站在那儿——鼓起勇气跳动吧！

It is therefore important that you screw up your courage when courage is needed.

因此重要的是在需要勇气时鼓起自己的勇气。

You need to screw up your courage and drink a couple beers and you'll be just fine.

鼓起勇气喝他几瓶啤酒，我想你很快就会复原了。

No matter how uncomfortable it may seem, but you should screw up your courage to have an unpleasant conversation and stand your ground.

似乎无论多么不舒服，但是你应该鼓起勇气进行一次不愉快的谈话，坚守阵地。