讲解文本：

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。

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