微型车和中型车均以每小时40英里的速度行驶，因此碰撞时速度为每小时80英里。
Both the minicars and midsize cars were traveling 40 miles per hour, so the crash occurs at 80 M.P.H.
它们被聚集起来投入实验，此时速度大约是5米每秒——仅为空气中分子自由碰撞速度的百分之一。
They are gathered up and injected into the quantum experiment at speeds of around five meters per second - just a hundredth the speed of the molecules flying around in the air.
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