English in a Minute:Canary in a Coal Mine

发表时间:2017-06-19内容来源:VOA英语学习网

What do small yellow birds have to do with a dark coal mine? Learn the meaning and history of this expression with Anna, Jonathan and Ashley.

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来自:VOA英语网 文章地址: http://www.tingvoa.com/html/20170619/English-in-a-Minute-Canary-in-a-Coal-Mine.html