In Britain the longest river is the Severn river.

在英国最长的河流是塞文河。

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The longest river in Britain is the Severn river. The most important river is Thames river.

英国最长的河流是赛文河，最重要的河流是泰晤士河。

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The longest river in Britain is the Severn river. The most important river is Thames river. River Clyde is the most important river in Scotland.

英国最长的河流是赛文河，最重要的河流是泰晤士河。克莱德河是苏格兰最重要的河流。

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Operated by private company Severn River Crossings Plc, the bridges are used by about 80, 000 vehicles every day.

BBC: Severn Bridge tolls

Operated by private company Severn River Crossings Plc, the M4 and M48 bridges over the Severn are used by about 80, 000 vehicles every day.

BBC: Severn bridges: Tories say Welsh government should run

Currently run by Severn River Crossing Plc, the bridge will return to public ownership when the firm has collected a fixed sum of money from tolls, expected to be around 2017.

BBC: Welsh Affairs Select Committee