I don't want to fire him.His ideas are very good.
我不想辭退他。他的創意非常不錯。
But his arrogance is getting everybody uncomfortable.You have to bite the bullet and let him go.
但是他的傲慢讓每個人都不舒服。你必須忍痛割愛，辭退他吧。

In this economic downturn,you have to bite the bullet,and cut down on welfare.
在這樣經濟不景氣的時期，你不得不做出削減福利開支的艱難決定。
Why don't you go to work on bicycles instead of in expensive cars.
那為什么你還坐著昂貴的汽車上班，而不騎自行車呢?

精講部分
You have to make a difficult decision.
You have to bite the bullet.
Bite the bullet就是“吃子彈”嘍，在美國內戰時期，給受傷士兵做手術時，作為麻醉劑的威士忌短缺，這個時候醫生就會讓士兵口含子彈，疼的時候就咬下去。后來bite the bullet逐漸引申為“做出一個艱難的抉擇”或者“忍痛割愛”。