underground;subterranean;secret ;

Investigations had revealed extensive rot in the beams under the ground floor.
调查发现一层地下的横梁大面积腐烂。
来源:《柯林斯高阶英汉双解学习词典》They are accused of organising and financing an underground youth movement.
他们被指控组织并资助地下青年运动。
来源:互联网摘选Bus routes and railways, both overground and underground, converged on the station.
公共汽车线路和地上地下路轨都在该站交汇。
来源:《柯林斯高阶英汉双解学习词典》The dug-outs were secure from everything but a direct hit.
除非是直接被击中,否则这个地下掩体是非常安全的。
来源:《柯林斯高阶英汉双解学习词典》He was a courier for the Polish underground and parachuted into Warsaw.
他是波兰地下组织的情报员,被空降到华沙。
来源:《柯林斯高阶英汉双解学习词典》There's an underground passageway that connects the five buildings.
有一条地下通道连接着那5栋大楼。
来源:《柯林斯高阶英汉双解学习词典》The inves-tigators found that the underground pipes were badly corroded.
调查人员发现地下管道严重腐蚀。
来源:《柯林斯高阶英汉双解学习词典》
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