在胚胎发育阶段，兴奋和抑制性神经元的适当比例确立以优化大脑功能。

During embryonic development, the proper ratio of excitatory and inhibitory neurons is established for optimal brain function.

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这样可以使得女性的怀孕阶段与整个职业生涯相比占更小的比例。

Child-bearing years will thus make up a smaller proportion of women’s potential working lives.

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在测试的简单阶段，天才男孩战胜天才女孩的比例是2：1；难度达到中等时，这个比例增至4：1；到了最难的阶段，这个比例达到13：1。

At the easier levels, gifted boys beat gifted girls on a ratio of 2:1; in the middle levels the ratio increased to 4:1; and at the highest degree of difficulty it reached 13:1.

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