请问planet和comet的英文解释是什麽呢
comet: [ 'kɔmit ] n. 慧星词形变化: 形容词:cometary 例句与用法: 1. Comets move around the sun like planets, but in long oval course. 彗星象行星一样绕太阳运转，然而其轨道呈狭长的椭圆形。 2. A comet is at perihelion when it is closest (=very close) to the sun. 彗星最接近太阳时，它就是在近日点。 3. If I...