例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
该报告的作者推测，男孩在胎儿发育阶段可能对此类化学袭击反应更为敏感，这就可以解释为什么男孩比女孩更有可能出现行为问题。
The foetal development of boys may also be more sensitive to this kind of chemical assault, the authors speculate, which could explain why boys are more likely to have behavioural problems than girls.
众所周知，孕妇饮酒过度会导致胎儿出现酒精综合征，引发孩子出生后的行为和身体损伤。
It's well known that fetal alcohol syndrome occurs when pregnant women drink excessively and causes behavioural and physical harm to the child after birth.
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