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1·Scientists explain that, with each male fetus, a mother develops an increased immunization to an antigen produced by the male fetuses, and this antigen likely plays a role in masculinizing the brain.

科学家们对此是这样解释的，母体在生育每个男性胎儿时，会为男性胎儿产生的抗原培育出一套增强的免疫系统，而这种抗原很可能在大脑的男性化过程中发挥着重要作用。