deep underground metal detector
... 水中金属探测器：Water Metal detectors 大深度地下金属探测器：Deep underground metal detector 可视地下金属探测器：Visual underground metal detector ...
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deep underground metal detector
深地下金属探测器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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He told Australian media the prospector had been using a state-of-the-art metal detector, which meant he was able to find the gold relatively deep underground in an area which had been searched many times in the past.
BBC: The gold nugget found in Ballarat