turn my back on 袖手旁观
How can I turn my back on him?
我又怎么能袖手旁观呢？
I can't turn my back on him when he needs help.
在他需要帮助的时候，我们不能不管。

figure out 找出
If I figure out how that works I'll post an update.
笔者弄清真相后将会发布最新发现。
Figure out which tools your employer relies on.
搞清楚雇主依赖的工具是什么。

Shut up 闭嘴
Shut up. I like this.
闭嘴，我喜欢这么穿
Some of them need to buck up, and some of them need to shut up.
或许他们中的某些人应该给自己充充电，而有些人应该闭上嘴。