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N-COUNT
（天體等運行的）軌道
An orbit is the curved path in space that is followed by an object going round and round a planet, moon, or star.
例句
Mars and Earth have orbits which change with time...
火星與地球的運行軌道隨著時間而變化。
The planet is probably in orbit around a small star.
這顆行星可能正環繞著一顆小恒星運行。
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VERB
環繞…的軌道運行
If something such as a satellite orbits a planet, moon, or sun, it moves around it in a continuous, curving path.
例句
In 1957 the Soviet Union launched the first satellite to orbit the earth.
1957年，蘇聯發射了第一顆繞地衛星。
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N-SING
（影響所及的）范圍，領域，圈子
The orbit of a particular person, group, or institution is the area over which they have influence.
例句
In the late 1970s Laos fell within the orbit of Vietnam and the Soviet Union.
20世紀70年代末，老撾被納入了越南和蘇聯的勢力范圍。