Rain kept underground, like a curtain hanging outside the window.

雨淅淅沥沥不停地下着，像是在窗外挂了一层帘子。

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In the underground maze of tunnels, the Romans kept "every type of exotic animal that they were able to bring here," including rhinos and snakes, Nazzaro said.

地下的隧道迷宫里，罗马人保留着“他们能够带来的各种类型的外来动物”，包括犀牛和蛇，纳扎罗说。

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It is important that this underground room be kept dark. Light can cause potatoes to develop a poison called solanine.

但保持这个地下室阴暗是非常重要的，因为光会导致马铃薯产生一种茄碱的毒素。

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Katie Beers, who was kidnapped as a 9-year-old in 1992 and kept in an underground bunker in suburban New York for 17 days before her captor surrendered to police and showed them where she was hidden, said she was "ecstatic" that Ethan was rescued safely.

WSJ: Military tactics, arms, helped rescue Ala. hostage

It must have been kept fresh by an underground stream, because the water was cold and clear.

NEWYORKER: Wakefield

The interferometer in Japan is being built underground and will be kept at extremely low temperatures to minimise stray vibrations.

ECONOMIST: Fundamental physics