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Wherever there's a road, there's a coalmine.

哪儿有路，哪儿就有煤矿。

youdao

The rescuers used a special device for finding people trapped in the coalmine.

救援者用一种特殊装置寻找被困在煤矿井下的人们。

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He said the Cambrian disaster had shocked other miners, partly because it was considered to be a modern coalmine.

BBC: NEWS | UK | Wales | South East Wales | Fatal mine explosion remembered

Serving as a psychological canary in the coalmine of your life, warning you to re-evaluate the wisdom inherent in following one particular path relative to alternative ones.

FORBES: Worried About Anxiety? Don't Be; It's Often Good For You.

Since the Arctic as a whole is responding to climate change earlier and more acutely than the rest of the planet, we should think of it as an early warning system -- a proverbial canary in a coalmine.

CNN: Next global warming worry: Thawing tundra