Also, PAHs may affect the fetus' DNA directly.
多环芳烃同样对胎儿的DNA产生直接影响。
PAHs, known to increase the risk of breast cancer.
多环芳烃，已知会增加乳腺癌的风险。
This is a second, but indirect, way in which PAHs can cause cancer.
这是第二次，但间接的方式多环芳烃可以导致癌症。
This is a second, but indirect, way in which PAHs can cause cancer.
这是第二次，但间接的方式多环芳烃可以导致癌症。
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