英汉词典

1. （天体等运行的）轨道
    An orbit is the curved path in space that is followed by an object going round and round a planet, moon, or star.

    e.g. Mars and Earth have orbits which change with time...
           火星与地球的运行轨道随着时间而变化。
    e.g. The planet is probably in orbit around a small star.
           这颗行星可能正环绕着一颗小恒星运行。

2. 环绕…的轨道运行
    If something such as a satellite orbits a planet, moon, or sun, it moves around it in a continuous, curving path.

    e.g. In 1957 the Soviet Union launched the first satellite to orbit the earth.
           1957年，苏联发射了第一颗绕地卫星。

3. （影响所及的）范围，领域，圈子
    The orbit of a particular person, group, or institution is the area over which they have influence.

    e.g. In the late 1970s Laos fell within the orbit of Vietnam and the Soviet Union.
           20世纪70年代末，老挝被纳入了越南和苏联的势力范围。