彗星

The earth crosses the tracks of certain comets.

地球穿过某些彗星的轨迹线。

Halley's Comet has an eccentricity of about 0.9675.

哈雷彗星的偏心率约为0.9675。

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

古代，彗星的起普遍的恐慌。

Did you ever see a comet?

你看见过彗星吗?

Recently they have discovered a comet.

最近他们发了一颗彗星。

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

那彗星（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.

不发生瘟疫】战争和地球不和彗星发生碰撞的情况下，类的会迅速的发展。

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，你得结论——我们的彗星颗粒看上去更接近多孔球粒陨石IDPs而不是CI球粒陨石。