If all the train tickets are sold out for the holidays, we might have to bite the bullet and drive to London.

It comes from stories of long ago, when a wounded soldier was told to bite a bullet before undergoing surgery without anesthesia, to avoid crying out in pain. 

這個俚語來自很久以前的一個故事。當時一名受傷的士兵要在不麻醉的情況下進行手術(shù)，避免因疼痛而大叫。

Sometimes you want to break down and cry about the shit you go through, but then you realize that's life! You gotta bite the bullet, put a smile on your face and move on! 

有時候，你覺得自己要崩潰了，為自己所經(jīng)歷的糟糕事情哭泣，但你要意識到這就是生活！你要咬緊牙關(guān)，面帶微笑，繼續(xù)前行！

Having been in the corporate world for many years, I decided to bite the bullet and set up a business based on all my loves. 

在公司工作多年后，我決定咬緊牙關(guān)，開始以自己所有愛好為基礎(chǔ)進行創(chuàng)業(yè)。