已知茄属植物种类的仅仅不到一半不能自交。
Just under half of the known nightshade species cannot self-fertilize.
湿热的热带丛林里丰富多彩的野生生物构成了整个地球动植物种类的一半还要多。
The colourful wildlife found in tropical humid forests makes up more than half of the animal and plant species on Earth.
许多地区的动植物种类曾比现在丰富，使得它们非常适合人类居住。
Many areas were richer in animal and plant species than they are now, making them highly favorable for human occupation.
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