Canary in a coal mine 矿井中的金丝雀,指危险的先兆。金丝雀对有害气体的敏感度超过人体,所以金丝雀就成了矿工们的警报器,矿工下井带着金丝雀,如果金丝雀暴毙,就说明井下有危险气体,需要立即逃生。Wildlife in disaster movies often play the role of the canary in a coal mine by acting crazy when danger is present. 灾难片里的野生动物经常扮演矿井里金丝雀的角色,出现危险时做出疯狂的表现。