an underground

• 地下工作者

an underground的用法和样例：

例句

1. An underground bed or layer of earth, gravel, or porous stone that yields water.
   地下蓄水层，砂石含水层含有水的泥、砂砾或多孔石的地下河床或地层
2. 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
3. There is an underground car park near the supermarket.
   这个超市附近有一个地下停车场。
4. The prisoner escaped by digging an underground tunnel.
   囚犯挖了一条地道逃跑了。