muscle insertion

例句：

1. 1. The doctor inserted a needle into her arm to administer anesthesia.
   医生将针头插入她的手臂以进行麻醉。
2. 2. During the race, the runner inserted his foot into the hole in the ground.
   在比赛中，跑者将脚插入地面的洞中。
3. 3.The scientist inserted a probe into the sample to analyze its chemical composition.
   科学家将探针插入样本中以分析其化学成分。