orbit

1. N-COUNT An orbit is the curved path in space that is followed by an object going around and around a planet, moon, or star. (天體運(yùn)行的) 軌道[also 'in/into' N]

Mars and Earth have orbits which change with time. 火星和地球的軌道隨著時(shí)間而發(fā)生改變。

2. V-T If something such as a satellite orbits a planet, moon, or sun, it moves around it in a continuous, curving path. 環(huán)繞…的軌道運(yùn)行

In 1957 the Soviet Union launched the first satellite to orbit the earth. 1957年，蘇聯(lián)發(fā)射了第一顆環(huán)繞地球運(yùn)行的人造衛(wèi)星。