ion pair extracted species 离子对萃合物
Many of the species pair for life.
许多物种都终生配对。
If you own a pair of binoculars or a microscope, there are at least 5 million species out there awaiting your gaze.
要是你拥有一副双筒望远镜或者显微镜的话，那就尽情观察吧，外面至少有500万种物种等着你呢！
To test this idea, the team studied the DNA of pairs of closely related plant species in which one member of the pair was tropical and the other was found closer to the poles.
为了验证这个想法，科研小组们研究了几对植物的DNA，每一对均由亲缘关系很近的两种植物组成。 而且，其中的一种植物属于热带植物，另一种则属于靠近极地生长的寒带植物。
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