而航行者1号是速度最快的,正以约每秒17千米的速度脱离太阳系。
Voyager 1 is moving the fastest though, escaping the solar system at about 17 kilometers per second.
事实上我们有很多轨道垃圾,以每小时10-20千米的速度运行。
The truth is we do have a lot of debris, and travelling at 10 to 20 thousand miles an hour.
熔岩顺着山体陡峭的一面以每小时100千米的速度迅速流泻出熔岩湖。
Runny lava flowed down its steep sides at rates of nearly 100 km per hour, quickly draining the lake.
Sometimes they give you the speed in miles per hour, kilometers per year, pounds per square foot.
有时候速度的单位是英里/小时,千米/年,英磅/平方米
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