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。
Instead of waiting for an airport shuttle, Heathrow passengers can hop in one of the pods that arrive every 34 seconds and travel along tracks between the terminals and car parks.
无须等待机场接送，希思罗机场的乘客可以跳进一辆运输吊舱内，每34秒出一舱，运行在航空终点站和停车场之间的轨道上。
Primates and birds' brains have evolved along different tracks, but ended up with similar abilities.
灵长类动物和鸟类的大脑沿着不同的轨迹进化，但最终拥有相似的能力。
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