the population of aphids is normally kept down by other animals.
蚜虫的数量通常被其他动物控制水平上。
the population of aphids is normally kept down by other animals.
蚜虫的数量通常被其他动物控制水平上。
In some species, such as aphids, the flightless morph lacks wings and is called the apterous morph.
一些昆虫种类,如蚜虫,出现翅个体,被称为翅型。
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