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。

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.

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在英国伦敦剑桥大学有一座桥，横跨流经校园的一条河-，河上面，其实有两座桥。

And there is a bridge at the University of British Columbia that crosses a river that runs through campus and the rickety — there's actually two Bridges.

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And there is a bridge at the University of British Columbia that crosses a river that runs through campus and the rickety-- There's actually two bridges.

在英国伦敦剑桥大学有一座桥,横跨流经校园的一条河-,河上面，其实有两座桥。

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