underground

过去式：

动词过去式: undergrounded

更多词形：

动词过去式: undergrounded | 动词过去分词: undergrounded | 动词现在分词: undergrounding | 动词第三人称单数: undergrounds |

单词例句：

The quickest way to go round the city is by underground train.

在这个城市四处走动最快的办法就是乘坐地铁。

An underground defensive position with a fortified projection above ground level for gun emplacements.

掩蔽壕，地堡一个地下防御工事，有一个高干地面的，用来放枪的防御射击处

Reccntly they have laid an underground pipeline.

最近,他们铺设了一条地下管道。

They were making a plan underground.

他们在秘密地策划。

The prisoner escaped by digging an underground tunnel.

囚犯挖了一条地道逃跑了。

He went underground to avoid arrest.

他隐藏起来以防被捕。

The spy never told his family about his underground activities.

这位间谍从未把他的秘密活动告诉家里人。

They dived into the Underground to escape the rain.

他们急忙钻进地铁避雨。

The area contains vast underground cave systems.

这个地区拥有庞大的地下洞穴系统。