Speed: Miles per hour, Kilometers per hour, Miles per second, Kilometers per second, Meters per second
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Despite moving at 18 miles per second, it still takes the Earth a year to make it around the Sun.
不管地球的运行速度只有每秒钟18英里,它还是一年又一年地围绕着太阳运转。
Light travels at about 300, 000 kilometers per second (186, 000 miles per second) — that's pretty fast.
光速大约为每秒300,000公里(即每秒186,000英里)——非常之快。
The escape velocity needed by a spacecraft to overcome the tug of Earth’s gravity is around seven miles per second—ie, Mach 34.
宇宙飞船克服地球引力所需的逃逸速度约为每秒7英里(也即34马赫);
We don't usually do our chemistry calculations in miles per hour, so let's switch that to 42 meters per second, so it's -- sorry, it's 94 miles per hour.
在化学计算中我们很少,用英里每小时,所以我们把它换算为42米每秒,对不起,它是94英里每小时。
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