underground

The scientists discovered an ancient underground river flowing beneath the Sahara Desert.

(Chinese) 科学家们在撒哈拉沙漠下方发现了一条古老的地下河。

The building has a secure underground parking garage for its residents.

(Chinese) 这栋建筑为居民设有一个安全的地下停车库。

Many commuters in London prefer using the Underground to avoid heavy surface traffic.

(Chinese) 许多伦敦通勤者更喜欢乘坐地铁以避开地面沉重的交通流量。

The nearest entrance to the underground is located just around the corner from the museum.

(Chinese) 离地铁最近的入口就在博物馆拐角处。