scab of pear

例句：

1. 1. The scab on his arm has started to heal.
   他手臂上的痂开始愈合了。
2. 2. The doctor removed the scab and stitched up his wound.
   医生把痂弄掉并缝合了他的伤口。
3. 3. The scab fell off after a few days of treatment.
   治疗几天后，痂脱落了。