in vivo fertilization

例句：

1. 1. In vivo fertilization is a process that involves thetransfer of sperm and egg directly into theuterus.
   活体受精是一种涉及将精子和卵子直接转移到子宫的过程。
2. 2. The success rate of in vivo fertilization has been increasing due to advancements in technology.
   由于技术进步，活体受精的成功率正在提高。
3. 3. In vivo fertilization is a controversial topic inreproductive medicine.
   活体受精在生殖医学中是一个有争议的话题。