1. a host of 大量
I believe that this view is mistaken and that it leads to a host of entirely unnecessary difficulties.
我相信这种看法是错误的，而且它导致一大堆完全不必要的困难chxcDQ!8|==4W。

2. a contingent of 一支……的队伍
A contingent of qualified space scientists and technicians has come to the fore.
培育了一支素质好、技术水平高的航天科技队伍[~pU(%PLi*9wdy。

3. as a deterrent to 最为对……的威慑
I believed that death penalty would act as a deterrent to crime.
我相信死刑会对犯罪行为起到威慑作用O~5^dgo%,w~+r%P~Uv6。

4. back up 支持
I can find the data to back up that claim.
我能找到证据来支持这种说法k[2&9(-F2twQaB。