英语语法分析

Rarely pericardial effusion can be caused by infection and consist of pus.

心包积液也能由感染引起，所积液体为脓液，但很罕见。

A horse with this joint problem may or may not be lame or have joint effusion.

有此关节疾病的马可能会或可能不会跛脚，或有关节积液。

Objective:To explore the feature of the pleural effusion aroused by heart failure.

目的：探讨心力衰竭引起的胸腔积液的特点。