Twenty-nine of them died in an explosion at an underground mine in West Virginia on April fifth,twenty-ten.

VOA: special.2011.07.01

and there's an underground area

我们还有一部分地下的区域，

布朗的学生们 - SpeakingMax英语口语达人

What we don't get here is a sense of whether there really is an alternate secret postal system that serves a sort of underground of private networks.

在这里我们所不明白的是，是否真的存在一个,提供地下的,私密的通信服务的，秘密邮政系统。

耶鲁公开课 - 1945年后的美国小说课程节选

And if that is not exciting enough, the friends discover an underground land of dinosaurs.

VOA: special.2009.06.12

You can enter the glass building and walk downstairs to an underground visitors center.

VOA: special.2010.06.23

He saw that an underground spring flowed under the ice at that spot.

VOA: special.2010.05.01

In two thousand six a nearby art museum began an underground building project.

VOA: special.2010.04.07

"All of this is contributing to an underground, sort of 'black' economy, which is very difficult for any of us to measure and gauge.

VOA: standard.2010.06.17

Black cohosh is an herb that comes from the root or underground stems of a tall plant in the buttercup family.

VOA: special.2009.05.19