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1. The journal detector detected a small piece of metal in the room.
日记探测器在房间里探测到了一小片金属。
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2. The engineer used a journal detector to find the source of the leak.
工程师使用日记探测器找到了泄漏的源头。
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3. The journal detector helped the detective solve the case by providing evidence from the past.
日记探测器帮助侦探通过提供过去的证据解决了案件。