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1、orbit
（天体等运行的）轨道
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。
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。
环绕…的轨道运行
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。
（影响所及的）范围，领域，圈子
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。
2、mission
(尤指赴他国的)使命，重要任务
Salisbury sent him on a diplomatic mission to North America.
索尔兹伯里派他到北美执行一项外交任务。
He has been on a mission to help end Lebanon's political crisis.
他已经被派执行一项旨在帮助结束黎巴嫩政治危机的使命。
驻外使团;出国代表团
the head of the mission in South Africa.
驻南非代表团团长
a senior member of a diplomatic mission.
外交使团的高级成员
