In order to provide the convenience for passengers with the shortest travel time as the object, the mathematic model of optimizing average stop distance is built up.

为方便市民出行，以乘客的出行时间最小为目标，得到了公交线路中途站点最优平均站距的数学模型；

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The large grey-feathered birds, known for the bright red skin above their eyes, a loud trilling call that can be heard up to a mile away, and a wingspan of up to 7ft, travel around 350 miles a day from Texas, Oklahoma or Mexico to stop in Nebraska on their way to their breeding grounds, which are spread across the northern United States and Canada.

BBC: Nebraska��s awe-inspiring crane migration

Trains travel at a top speed of 70 mph and can take up to half a mile to stop.

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