Moisture from an underground river had dampened the walls.

地下河的湿气使周围墙壁也很潮湿。

youdao

It is said that the underground river here can link with the East Sea.

此处的地下暗河据说可直通东海。

youdao

The mysterious source of the lake is believed to be an underground river that has yet to be located.

据说，湖水的神秘源头是还未确定明确方位的地下河。

youdao

After the passage is over, Milton addresses Alpheus, a river god -the god who was noted for plunging the course of his river underground in order to chase the nymph Arethuse who had been turned into a fountain.

这段结束后，弥尔顿引用了河神阿尔甫斯,那位因私底下掀起河流的波浪而闻名的神,以此来与被变成海底之泉的女神阿托瑞萨相互融合。

耶鲁公开课 - 弥尔顿课程节选

It will include relaxation, group discussions, an underground river and plenty of group meals.

FORBES: Connect

Locals blamed earthquakes, local salt mines, an underground river and wind turbines in the past.

WSJ: Canadians Make a Racket Over Mysterious 'Windsor Hum'

John Collins carried the Olympic Flame through Marble Arch Caves on a boat, navigating the underground river on its way to the London Olympics.

UNESCO: Olympic torch carried through iconic Geopark