The chemicals that race around in our brain when we're in love serve several purposes, and the primary goal is the continuation of our species.

当我们沉浸于爱，那些作用于我们大脑的相关化学物质有很多意义，它们的首要目的就是要保证我们种族的延续。

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The species is known to see colors invisible to humans and other animals, viewing the world in 11 or 12 primary colors, as opposed to our humble 3.

人们发现这种生物能够看到人类和其他动物看不到的颜色，相对于我们可怜的3原色而言，它们看到的世界是由11或12种原色组成的。

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The average number of primary lamellae varies with sub-families, genera, and species.

初级嗅板的平均数在亚科、属，种之间具有。

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"Aesthetic standards have become one of the primary determinants of which species are deemed worthy for conservation and this has to be looked at, " he said.

CNN: Beauty trumps beast in conservation efforts

"We, along with other people, had assumed that this was the primary mating event for this species and a lot of other related species, " he said.

BBC: Yorkshire bat colonies 'cohabit all year'

The states also will look for agreement on the best way to regulate ballast water dumped by oceangoing cargo ships, the primary vehicle by which aquatic invasive species have reached the Great Lakes.

WSJ: Great Lakes governors seek agreement on invasives