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

在古代，的出现引起普遍的恐慌。

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

那将（不用 shall ) 在87年后返回。

The earth crosses the tracks of certain comets.

地球穿过某些的轨迹线。

Did you ever see a comet?

你看见过吗?

Recently they have discovered a comet.

最近他们发现了一颗。

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

在不发生瘟疫】战争地球不发生碰撞的情况下，人类的人口将会迅速的发展。

"Selective Breeding has produced more than 125 Breeds, including the veiltail, with a three-lobed, flowing tail, and the common, pet-shop comet. "

人们选择不正常的个体,已经成125个以上的金鱼品种,包括常见的具三叶拂尾的纱翅、戴绒帽的狮子头以及眼睛突出且向上的望天。

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——我们的颗粒看上去更接近多孔球粒石IDPs而不是CI球粒石。