Therefore a gradually decreasing infant mortality rate has led to a proportionate decrease in the size of our brains.

因此，婴儿死亡率的逐渐降低导致大脑容量成比例的减少。

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Therefore a gradually decreasing infant mortality rate has led to a proportionate decrease in the size of our brains.

因此，婴儿死亡率的逐渐降低导致大脑容量成比例的减少。

youdao