彗星

The earth crosses the tracks of certain comets.

地球穿过某些的轨迹线。

Halley's Comet has an eccentricity of about 0.9675.

哈雷的偏心率约为0.9675。

The appearance of a comet caused universal dismay in the ancient world.

古代，的出现引起普遍的恐慌。

Did you ever see a comet?

你看见过吗?

Recently they have discovered a comet.

最近他们现了一。

The comet will (not shall ) return in 87 years.

那将（不用 shall ) 87年后返回。

The population will keep going up if there is no murrain or no interference between the earth and comet.

不疫】战争和地球不和碰撞的情况下，人类的人口将会迅速的展。

If you look over the element ratios we measured, you might conclude that our comet particles look more like chondritic porous IDPs than CI chondrite meteorites.

如果你查看我们测定的元素比率，你将得出结论——我们的粒看上去更接近多孔球粒陨石IDPs而不是CI球粒陨石。