zài / tǎolùn / gōnggòng / wèishēngshǐ / shí / lǎoshī / jiěshì / le / wǔfèi / zhège / cí / de / láiyuán / hé / shǐyòng / biànhuà

在讨论公共卫生史时，老师解释了“武肺”这个词的来源和使用变化。

While discussing the history of public health, the teacher explained the origin of the term “武肺” and how its usage changed.