aerobraking

n.利用大气之摩擦而减低太空船之运动速度

This process is a natural version of the aerobraking procedure that many planetary probes have used to enter orbit. 这可说是自然界的空气煞车程序，许多行星探测船都得靠著空气煞车来进入轨道。

In the coming months, MRO's orbit will be circularized through repeated passages into Mars' outer atmosphere, a process known as aerobraking, shrinking its orbit to an altitude of only 280 kilometers. 在接下来的几个月里，MRO的轨道将重复经过火星的外大气层，这就是减速过程，它将轨道高度降低到只有280公里。