Canaries are said to have been used to detect gas in coal mines in the early stages of coal mining.

在煤矿开采的早期，人们已用金丝雀来检测瓦斯。

youdao

Canaries are said to have been used to detect gas in coal mines in the early stages of coal mining.

在煤矿开采的早期，人们已用金丝雀来检测瓦斯。

youdao