这条管道半径两端间存在一速度差。
There is a velocity difference across the radius of the pipe.
这两端间的通信协议可以是任何你想要的协议。
The protocol between the two can really be anything you want.
大陆的两端间的广阔的距离使古非洲人显得不可能拥有大范围的交换系统。
The immense distance between the two ends of the continent makes an ancient African exchange system appear improbable.
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