zài / niú / dòu / miáo / wènshì / yǐqián / tiānhuā / céngjīng / duózǒu / le / xǔduō / rén / de / shēngmìng

在牛痘苗问世以前，天花曾经夺走了许多人的生命。

Before the smallpox vaccine was developed, smallpox claimed many lives.