bite the bullet 咬紧牙关，忍受困难，硬着头皮做某事

　　I know this is going to be hard, but we have no choice. We'll just have to bite the bullet.

　　我知道这很难，但我们别无选择，只能咬紧牙关上了。

　　I just need to bite the bullet and take the exam to graduate.

　　为了毕业我只能硬着头皮去考试了。

　　疯狂练习吧！