orbit /ˈɔ:bit/ I. n. ［c］轨道：the earth’s orbit around the sun 地球绕太阳旋转的轨道；the lunar orbit 月球的轨道；put a man-made earth satellite into orbit 把人造地球卫星送入轨道‖II. vt. 环绕(天体)的圆周运行：In 25 hours the spaceman orbited the earth 17.5 times and covered nearly 435000 miles.这位宇航员在25小时内绕地球17周半，距离近43.5万英里。