1.coexist with 與…同時存在，與…共存

That is to say, it coexists with poetic language.
這就是說，實用語言和詩歌語言并存。

That is the trick, after all, of Ms. Shteynshleyger's work: Prickly self-protection coexists with supreme vulnerability.
畢竟這就是Shteynshleyger作品的技巧所在：仙人掌形的自我保護與極端的內心脆弱并存。

2.in exchange for 交換

Mr monti's big idea is a swap: liberalism in exchange for redistribution.
蒙逖先生的妙計是一個互換機制：自由主義交換再分配。

You'll get free accommodation in exchange for watering some plants and walking a dog.
你將會獲得免費住宿，與此相交換的就是你要做一些植物澆水、遛狗的工作。

3.prime target 主要目標

It's a prime target for terrorist attacks.
這是恐怖分子攻擊的首要目標。

One prime target has been cash management for chinese companies that are expanding abroad.
一個主要目標是在海外擴張的中國企業的現金管理。

4.keep down 控制；使不升起；使留級

They try to keep down the cost of living.
他們努力壓低生活費。

Keep down, stay still.
保持低姿勢不要動！