1.coexist with 与…同时存在，与…共存

That is to say, it coexists with poetic language.
这就是说，实用语言和诗歌语言并存。

That is the trick, after all, of Ms. Shteynshleyger's work: Prickly self-protection coexists with supreme vulnerability.
毕竟这就是Shteynshleyger作品的技巧所在：仙人掌形的自我保护与极端的内心脆弱并存。

2.in exchange for 交换

Mr monti's big idea is a swap: liberalism in exchange for redistribution.
蒙逖先生的妙计是一个互换机制：自由主义交换再分配。

You'll get free accommodation in exchange for watering some plants and walking a dog.
你将会获得免费住宿，与此相交换的就是你要做一些植物浇水、遛狗的工作。

3.prime target 主要目标

It's a prime target for terrorist attacks.
这是恐怖分子攻击的首要目标。

One prime target has been cash management for chinese companies that are expanding abroad.
一个主要目标是在海外扩张的中国企业的现金管理。

4.keep down 控制；使不升起；使留级

They try to keep down the cost of living.
他们努力压低生活费。

Keep down, stay still.
保持低姿势不要动！