双程走时
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vertical two-way travel time 垂直双程旅行时
·2,447,543篇论文数据，部分数据来源于NoteExpress
Now, the 50-year-old Illinois woman says she bikes all the way to work several times a month from her home in Metamora to Peoria: 25 miles each way, amounting to about two hours of travel time.
CNN: Drivers, cyclists square off on sharing the road
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