英语语法分析

Preterm is defined as less than 34 weeks' gestation.

胎龄未满34周为早产儿。

Many preterm infants screen positive for autism at 18 months.

对18个月大的早产儿进行自闭症检查时有许多呈阳性反应。

Preterm birth, birth asphyxia and infections cause most newborn deaths.

早产、出生窒息和感染是儿童死亡的主要原因。