A toxic gas, colorless, odorless, tasteless, and initially non-irritating, is very difficult for people to detect.

是一种有毒气体，无色无味，最初无刺激性，人们难以发现。

youdao

A toxic gas, colorless, odorless, tasteless, and initially non-irritating, is very difficult for people to detect.

是一种有毒气体，无色无味，最初无刺激性，人们难以发现。

youdao