implantation fossa

例句：

1. 1. The embryo implants in the uterus during the first few weeks of pregnancy.
   胚胎在怀孕最初的几周内植入子宫。
2. 2. The surgeon performed a successful surgery to implant a new heart valve.
   外科医生成功地进行了一次新心脏瓣膜的植入手术。
3. 3. The researchers found that the implantation process was influenced by various environmental factors.
   研究人员发现，植入过程受到各种环境因素的影响。