The car is running at the speed of 60 kilometer per hour.

这辆车正在以每小时60公里的速度行驶。

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Yesterday, after a 3-year, 21-kilometer journey at top speeds of less than 0.2 kilometer per hour, the Opportunity rover finally arrived at Mars's Endeavour crater.

历经三年长途跋涉，穿越 21 公里的险途，以最高不到 0.2 公里每小时的速度，机遇号火星车终于成功抵达火星表面的奋进陨石坑。

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Since France introduced the first 260-kilometer-per-hour high speed train service between Paris and Lyons in 1981, the trains have achieved higher and higher speeds.

自从法国于1981年在巴黎至里昂推出首列时速260公里的高铁以来，列车的速度已经变得越来越快。

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