I don't want to fire him.His ideas are very good.
我不想辞退他。他的创意非常不错。
But his arrogance is getting everybody uncomfortable.You have to bite the bullet and let him go.
但是他的傲慢让每个人都不舒服。你必须忍痛割爱，辞退他吧。

In this economic downturn,you have to bite the bullet,and cut down on welfare.
在这样经济不景气的时期，你不得不做出削减福利开支的艰难决定。
Why don't you go to work on bicycles instead of in expensive cars.
那为什么你还坐着昂贵的汽车上班，而不骑自行车呢?

精讲部分
You have to make a difficult decision.
You have to bite the bullet.
Bite the bullet就是“吃子弹”喽，在美国内战时期，给受伤士兵做手术时，作为麻醉剂的威士忌短缺，这个时候医生就会让士兵口含子弹，疼的时候就咬下去。后来bite the bullet逐渐引申为“做出一个艰难的抉择”或者“忍痛割爱”。