众所周知，词汇是
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。