Pollution problems could hardly be resolved with single river engineering, which need the cooperative control of every region involved.

单一河流的整治往往不能解决问题，而是需要整个区域的协同控制。

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The iPod, iPad and iPhone are all an extension of the Mac, turning photos, videos, music and movies into a single river of pleasure that we can dip into on the train, on the sofa or on the move.

iPad和iPhone都是Mac的延伸，可以将图片、视频、音乐和电影融合成一条快乐的河流，无论在火车上、沙发上还是行走过程中，我们都可以畅游其中。

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The bridge crosses the river in a single span.

河上的桥为单跨桥。

《牛津词典》

The others fled single-file, lolloping across a river back to their familiar forests.

ECONOMIST: The battle to conserve India's elephants

Heading back to Arequipa, it is worth visiting some of the isolated settlements on the north side of the Colca River, reachable by a rough single-track road.

BBC: Exploring Peru��s epic Colca Canyon

The fury of a single monsoon cloudburst can precipitate enough water to overflow river banks.

ECONOMIST: From the archive