FETabbr.联邦货物税(=Federal Excise Tax)；场效应晶体管(=field effect transistor)Fetka费特卡

1. However, the major mode of transmission is infant exposure to maternal blood, which occurs throughout labor and delivery.
   然而母婴传播途径最主要的是当胎儿期间和分娩期间婴儿暴露在母血的时候。
2. Lamivudine therapy might not prevent perinatal transmission of HBV infection in every newborn.
   说明拉米夫定治疗不能阻断所有新生儿围产期的母婴传播。