n (1)轨道(path in which sth moves around a planet，star，etc，eg the path of the Earth round the Sun or a spacecraft round the Earth)[C]：the moon's～round the earth 月球绕地球运行的轨道;the～of the earth 地球的轨道;The satellite was launched into～around the moon.那颗人造卫星经发射已进入月球轨道。〖同〗course，track，path，way，route;

(2)势力范围(area of influence or control)[C]：When children are out of the family～，they sometimes behave badly.孩子一旦脱离家庭的管教，有时就不规矩了。I guess our buddy is off in～again.我想我们的伙伴又出去活动了。Such matters are outside my～.这种事不归我管。

v 环绕(某天体等的)轨道运行(move in orbit round(sth))[I，T+n]：The moon～s round the earth.月球环绕地球运行。How long does it take for the Earth to～the Sun?地球绕太阳转一周需要多长时间?〖同〗circle;

→′orbital adj 轨道的;势力范围的