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- Comet orbits are mostly long ellipses, so they spend most of the time far from the sun, cold. 彗星的轨道大部份是很长的椭圆;所以大部份时间离太阳很远;很冷.
- Like other meteor showers, such as the Perseids and the Orionids, the Leonids happen when Earth plows through a trail of debris left in the wake of a comet orbiting the sun. 类似于英仙座流星雨,猎户座流星雨以及其他流星雨,狮子座流星雨发生于地球在绕太阳公转过程中进入充满彗星碎片的流星体质点溪流之中。
- In the late 1980s, however, scientists determined that something like the Kuiper Belt was needed to explain why many short-period comets orbit so close to the plane of the solar system. 到了1980年代末期,科学家认定一定存在著类似柯伊伯带的东西,才可以解释为何有很多的短周期彗星,其轨道如此贴近太阳系平面。
- The spacecraft is in orbit around the moon. 该航天器在绕月球轨道运行。
- That comet is invisible to the unaided eye. 那颗彗星只用肉眼是看不到的。
- Earth crosses the orbit of Halley's Comet annually in October. 地球和哈雷彗星的轨道将于每年的十月份交叉。
- The space shuttle will orbit a weather satellite. 太空梭将把一个气象卫星送入运行轨道。
- The launch vehicle lifts the satellite into orbit. 太空火箭将人造卫星送入运行轨道。
- A comet is at perihelion when it is closest (=very close) to the sun. 彗星最接近太阳时,它就是在近日点。
- Something of circular form; a circle or an orbit. 圆形物体圆形物体; 圆圈或环形轨道
- The spacecraft is in orbit (ie moving in orbit) round the moon. 该航天器在绕月球轨道上飞行。
- If I had binoculars, I could see that comet clearly. 如果我有望远镜,我就可以清楚地看见那颗彗星。
- Marketing does not come within the orbit of his department. 市场推销业务不归他这一部门管。
- The comet's ice, heated by the sun, rapidly and spectacular sublimate to gas. 彗星上的冰块在太阳热的作用下迅速而壮观地升华成气体。
- If a comet crosses the Earth's orbit, we pass through this trail each year. 如果彗星穿过地球轨道,我们就会每年经过这条尾巴。
- The central portion of the head of a comet. 彗核彗星头部的中心部分
- Why else might the comet have come undone? 是什么导致了慧星的灭亡?
- The satellite was launched into orbit around the moon. 卫星被发射进入绕月球运行的轨道。
- The two spacecraft will link up (with each other) in orbit. 两艘宇宙飞船将於轨道上(互相)连接。
- By now, putting satellites in orbit is old hat to space scientists. 现在,对航天科学家来说,把卫星送入轨道已不是一桩新鲜事了。