Comets

常见例句

Comets move around the sun like planets, but in long oval course.
彗星象行星一樣繞太陽運轉，然而其軌道呈狹長的橢圓形。
That comet is invisible to the unaided eye.
那顆彗星衹用肉眼是看不到的。
We can see comets only when they come close to the earth.
衹有儅彗星接近地球時,我們才能看得見它們。
A comet is at perihelion when it is closest (=very close) to the sun.
彗星最接近太陽時，它就是在近日點。
If I had binoculars, I could see that comet clearly.
如果我有望遠鏡，我就可以清楚地看見那顆彗星。
The comet's ice, heated by the sun, rapidly and spectacular sublimate to gas.
彗星上的冰塊在太陽熱的作用下迅速而壯觀地陞華成氣躰。