英语语法分析

The cough medicine contains an expectorant.

咳嗽药中含有祛痰剂。

Licorice has been used for centuries as an expectorant to loosen phlegm.

甘草用于化痰已有几个世纪了。

Objective: to study antitussive, expectorant and antiasthmatic actions of Qiguanye pill.

目的：研究气管炎丸的止咳、平喘、祛痰作用。