They have designed a system which pumps up water from nearly 1,000 feet below ground.
他们设计了一个能从地表以下1000英尺处抽水的系统。
Much of the Metrorail system, which opened in 1976, runs below ground, including a section that goes under the Potomac River between Washington and Virginia and one that goes over it.
大多数于1976年投入使用的地铁线路都是在地下的，其中有一段在Potomac河(一条流经华盛顿特区的河，译者注)下面，穿过华盛顿特区和弗吉尼亚州，还有一段则在地上横跨Potomac河。
The system has been designed to operate above or below ground.
该系统被设计成在地面或地下运行。
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