kilometres per hour

基本解释

Even fragments a few centimetres in size are a hazard because they travel at many thousands of kilometres per hour.
即使仅有几厘米大小的碎片也是一场灾难，因为它们的速度可达每小时几千公里。
Redesigned with aero engines and larger wings, it could be made to fly at about 900 kilometres per hour with its nose angled up by about 5 degrees, Hawkes says.
要是重新设计一番，将它的翅膀加大，用航空发动机替代现有发动机，向上倾斜5度角飞行，每小时它大概能飞900公里，霍克斯说；
With the carbon wing strapped to his back, Rossy had leapt out of a small plane at an altitude of 2, 500 metres over the French coast before jetting off at speeds of more than 200 kilometres per hour.
当天罗西乘一架小飞机从法国出发，当飞机飞至距海面2500米的高空时，罗西背着碳制动力机翼一跃而下，并以每小时200多公里的速度飞行。