1. all of a sudden: 突然地，出乎意料地

eg. All of a sudden it will feel as though your days are almost empty.
某一刻你会忽然感到好像你的每一天都几乎是空空的。

eg. All of a sudden, I want to tell you about some things I do value and why.
突然之间，我想告诉你一些我确实重视的东西，以及重视它们的原因。

2. be able to: 有能力（或办法、机会）做某事

eg. I know someone who should be able to fix you up.
我知道有个人能提供你所需要的东西。

eg. Manufacturers must be able to juggle demands of all kinds.
制造商必须能够应付各种需求。

3. stick with: 坚持做，继续做

eg. It's easy to do anything if you stick with it.
如果你能坚持去做一件事，那么，就没有做不成的事。(或：持之以恒，必定成功。)

eg. But if the tool works well, then stick with it.
但如果工具适用，那么就应该坚持用下去。