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| ADV |
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| /ˌʌndəˈgraʊnd/ |
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| 1 | below the surface of the ground 在地面下 |
| miners who work all day underground 全天在地面下作业的矿工 |
| Many species of beetle live underground. 很多种甲虫生活在地下。 |
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| 2 | in or to a secret place away from the police or other authorities 暗中地；秘密地 |
| Left-wing activists were driven underground after the coup. 政变后左翼活动人士被迫转入地下。 |
| go underground The police became suspicious and he had to go underground. 警方开始怀疑了，他不得不躲藏起来。 |
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