In a matter of just a few years Beijing has gone from a city with few private cars to one where traffic jams are commonplace.

仅仅数年之内，北京已经从一个私家车很少的城市转变为一个交通拥挤非常普通的城市。

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The latter is a matter, in turn, of the demand for polyethylene, the world's most commonplace plastic.

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