foetus

例句：

1. 1.The foetus was born healthy and strong.
   胎儿出生时健康强壮。
2. 2. The foetus is developing rapidly in the womb.
   胎儿在子宫里迅速发育。
3. 3. The foetus's development is closely monitored by doctors.
   医生密切监控胎儿的发展。