众所周知，词汇是GRE考试的基础。那么怎样才能掌握GRE必备的词组呢？
这里为大家总结一些常用的核心词组，希望对各位备考有帮助。

本期GRE必备词组:
in the presence of 在……面前

  释义:

You use in the presence of when that thing is present.

 例句

Crying in the presence of a single other person is more helpful than crying alone to ease emotion.

 GRE

A low number of algal cells in the presence of a high number of grazers suggested, but did not prove, that the grazers had removed most of the algae.
在拥有大量食草类动物的环境中藻类细胞的数量很低，这表明这样一种可能——但不能证明：食草类动物消灭了大部分的藻类。