Solid low-level waste will be disposed of deep underground.
低放射性固体废物将被弃置在地下深处。
...an underground parking garage for 2,100 vehicles.
…一座能停放2100辆车的地下停车库。
The train was trapped underground by a fire.
列车被一场大火困在了地下。
I don't travel on the underground late at night.
我深夜不坐地铁。