Canaries no longer in coal mines for a reason. The threat of poisonous gas leakages, explosions and collapsing shafts has lessened in recent decades as the industry, led by multinational companies, has improved safety.
煤矿里不再有金丝雀了，这是有原因的。近几十年内，毒气泄漏、爆炸和矿井塌方的威胁已经减小，因为在跨国公司的带领下，采矿业已经提高了安全性。
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