We were not altogether sure that the comet would miss the Earth.
我们不太确定这颗彗星是否会错过地球。
The orbit of this comet intersects the orbit of the Earth.
这颗彗星的轨道和地球的轨道相交。
A huge comet is approaching the Earth and will be visible for a few weeks.
一颗巨大的彗星正在接近地球，几周内都可以看到。
We can see comet 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。
Is Comet Offered Water to the Earth?
地球上的水是彗星提供的吗？
Now, when the comet hit the earth, what would happen?
现在，当彗星撞地球，会发生什么？
Now, when the comet hit the earth, what would happen?
现在，当彗星撞地球，会发生什么？
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