km
abbr. [计量] 公里(kilometer);千米
例句
If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
如果一架宇宙飞船飞行超过每秒11公里,它就能摆脱地球引力。
《柯林斯英汉双解大词典》
For those uninitiated in scientific ocean drilling, the previous record was a little over 4 km.
可以告诉没有海洋科学钻探知识的人,先前的纪录是四公里过一点儿。
5 million km above the Earth.
距离地球表面5百万公里。