Only a small percentage of people had "all-male" or "all-female" characteristics.
只有一小部分人具有“全男性”或“全女性”特征。
Wealthy families have always had the option of sending their children to all-male or all-female academies, but parents of lesser means have rarely had the choice.
富裕的家庭一直都能选择把自己的孩子送入男校或女校就读,但收入不高的父母却没法做这样的选择。
Males don't help the female build a nest, incubate the eggs, or raise the chicks-all they give her are their genes. The females are thus very choosy about which male they pick.
雄鸟不会帮助雌鸟建巢、孵卵或哺育雏鸟——它们能够奉献的只有基因而已,因此,雌鸟在选择雄鸟时格外挑剔。
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