Halley's Comet has an eccentricity of about 0.9675.

哈雷彗星偏心率约为0.9675。

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

在古代，彗星出现引起普遍恐慌。

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

那彗星将（用 shall ) 在87年后返回。

The earth crosses the tracks of certain comets.

地穿过某些彗星线。

Did you ever see a comet?

你看见过彗星吗?

Recently they have discovered a comet.

最近他们发现一颗彗星。

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

在发生瘟疫】战争地彗星发生碰撞情况下，人类人口将会迅速发展。

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元素比率，你将得出结论——我们彗星颗粒看上去更接近多孔粒陨石IDPs而是CI粒陨石。