... mean blade width ratio 平均桨宽比 mean burning time 平均燃烧时间 mean camber 中弧线 ...
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Yet bottlenecks along tracks from coal-producing regions in northern China mean that many coal-burning factories in the South must rely on time-consuming shipments by barge.
即使如此，由于华北产煤区的运能瓶颈，南方的很多工厂仍然不得不使用耗时的水运来运输煤炭。
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