Maybe he points his little light detector at it and it reads out.

他可能会用一个光检测器对准苹果，仪器显示计量结果。

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A laser is shot out, and then it's read by a detector, producing an almost perfect reading.

一束激光发出，被一个探测器接收，产生一个几乎完美的接收。

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They passed through the metal detector at the door to their workroom (they pass through it going in and coming out) and walked downstairs to the racks where they had left their bikes.

她们走过设在车间门口的金属检测器（她们出入车间都要被检测），然后再走到楼下她们放自行车的地方。

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Maybe he points his little light detector at it and it reads out.

他可能会用一个光检测器对准苹果,仪器显示计量结果

耶鲁公开课 - 死亡课程节选

And for those particles that make it past the caesium iodide, a huge electromagnet tracks their passage out of the detector.

ECONOMIST: How to build a B-factory

He came across the ring while out with his metal detector in February 2004.

BBC: Gold 16th century ring

If I get delayed at the metal detector, the laptop won't be sitting out in the open for a long time.

WSJ: Tips to Take the Hassle Out of Travel