But we can use metal detectors to help us find other meteorites, and they're easier to spot by eye.

但是我们能用探测器帮助我们找到其他陨石，而这些陨石也更容易通过肉眼发现。

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When spot-welding, for instance, a robot has to touch the metal with an electrode.

例如，当点焊的时候机器人必须用电极接触金属。

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A: Can you spot weld a tube to a sheet metal?

你能把一个钢管点焊到钢板上吗？

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Johnson said the government was directing airports to carry out more random searches of passengers because metal detectors cannot spot explosives without metal parts.

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They lend gold bullion reserves to short sellers as well as to gold producers themselves, who then sell the metal in the spot markets.

ECONOMIST: Gold hedging

Ohioans have long had a soft spot for heavy metal, which became more popular when the U.S. Rust Belt lost its manufacturing clout in the 1980s, scholars say.

WSJ: Heady Metal: Scholars Celebrate a Rock Genre's Cultural Bang