Any of various electronic instruments for detecting the presence of metallic objects by means of their effects on an electromagnetic field; spec. (a)…
| 单词 | θ129996 |
| 释义 | the mind > attention and judgement > discovery > instrument for detection > [noun] > electronic (11) metal detector1924 Any of various electronic instruments for detecting the presence of metallic objects by means of their effects on an electromagnetic field; spec. (a)… tracer1972 A device which is designed to transmit a signal and which can therefore be traced when attached to a moving vehicle, etc. Subcategories:— use of (2) — used for specific purpose (7) |
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