Tree roots, sidewalk cracks and potholes can be dangerous.

树根、人行道的裂缝和坑洞会带来危险。

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Tiny gold links, rubies and even diamonds are embedded in the mud packed into the sidewalk cracks.

人行道砖缝的泥土里可能埋着小段的金链，红宝石甚至钻石。

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But he's not dabbling in the trade in the shops and boutiques - he's digging around in the sidewalk cracks for fractures and splinters of the precious metals and gems.

可他的工作不在商铺和精品店里——从人行道的缝隙里找寻贵金属和宝石碎屑才是他的致富之道。

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By latest count, about 250 species of native bees are known to nest in sidewalk cracks, traffic median strips, parks, and high-rise balcony flower pots more perhaps than any other major city in the world, several entomologists said.

WSJ: New Sweat Bee Generates Buzz