专家已经知道生男孩与女孩的机率,世界各地不同。
Experts already know that the birth rates of boys and girls vary across the globe.
皮质醇水平的大幅升高在男孩与女孩的行为举止上有不同的表现。
The larger elevations in cortisol meant different things for girls and boys in terms of behavior.
结果发现,测试题目越难,男孩与女孩的数学推理能力差距越是加大。
They discov- ered that the more difficult the tests became, the more the boys' ability exceeded that of the girls.
Let's say, a little boy and a girl sit next to each other.
假设一个小男孩与一个小女孩是同桌。
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