近些年来，被动吸烟逐渐成为了一个公共健康的威胁。

In recent years, secondhand smoke has emerged as a public health threat.

youdao

近些年来，被动吸烟逐渐成为了一个公共健康的威胁。

In recent years, secondhand smoke has emerged as a public health threat.

youdao