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- Copinus comets 鸡腿菇
- Comets move around the sun like planets, but in long oval course. 彗星象行星一样绕太阳运转，然而其轨道呈狭长的椭圆形。
- That comet is invisible to the unaided eye. 那颗彗星只用肉眼是看不到的。
- We can see comets only when they come close to the earth. 只有当彗星接近地球时,我们才能看得见它们。
- 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。
- 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。
- 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。
- 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 earth crosses the tracks of certain comets. 地球穿过某些彗星的轨迹线。
- Comets are usually made of ice and rock. 彗星通常是由岩石和冰构成的。
- Halley's comet calls on the earth every 76 years. 哈雷彗星每76年造访地球一次。
- The comet passed by in the twinkling of an eye. 俯仰之间，流星闪过。
- Comets are just as much members of the sun. 彗星和其它的行星同样是太阳家族的成员。
- Halley's comet visits the Earth once in 76 years. 哈雷彗星每七十六年经过地球一次。
- In that way, Pluto acts like a comet. 也就是说，冥王星的行为像一个彗星。
- Some people feel that this light was a comet. 一些人认为这种光是一种慧星。
- In history comets have a special place. 彗星在历史上占有特殊的地位。
- Aristotle was interested in comets. 亚里士多德对彗星很感兴趣，
- Comets are big, dirty snowballs that orbit our sun. 就不得不提到彗星了。
