fixation mark

例句：

1. 1.The doctor found a fixation mark on the patient's arm that could be traced back to an accident.
   医生在病人的手臂上发现了一个可以追溯到事故的固定标记。
2. 2. The scientist noticed a scar on his leg, which he believed was caused by a past injury.
   科学家注意到他的腿上有一个疤痕，他相信那是过去受伤留下的。
3. 3. The researcher found a fixation mark on the wall, which led him to believe that someone had been living there for some time.
   研究员在墙上发现了一个固定标记，这让他相信那里有人居住了很长时间。