The missing cat made a surprising reappearance after a week.

reappearance 是由前缀 re-（表示"再次"）和名词 appearance（出现）组成的复合名词。appearance 来自动词 appear（出现）加上名词后缀 -ance。 reappearance 字面意思是"再次出现"，指之前消失的事物又重新出现的情况。