orbit
/ˈɔ:bɪt; `ɔrbɪt/ n
1
(a) path followed by a planet, star, moon, etc round another body （天体运行的）轨道
the earth's orbit round the sun 地球绕行太阳的轨道.
(b) path of a man-made object, eg a satellite or space-craft, round a planet, star, etc （人造物体如卫星、 航天器等飞行的）轨道
The spacecraft is in orbit (ie moving in orbit) round the moon. 该航天器在绕月球轨道上飞行.
How many satellites have been put into orbit round the earth? 有多少颗人造卫星已送入绕地球轨道?
2 area of power or influence; scope 势力范围
Marketing does not come within the orbit of his department. 市场推销业务不归他这一部门管. orbit, v [I, Tn]
move in orbit round (sth) 在绕（某物）的轨道上运行; 环绕轨道运行
orbit in space 在太空中沿轨道运行
How many spacecraft have orbited the moon? 有多少航天器绕月球轨道运行?