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Hace 1 día · 本文目录怎样记英语词根var这个单词怎么读variable怎么读variable的否定前缀variation 和selective retention什么意思心理学moderator variable是什么意思怎样记英语词根词根 开放分类：
Hace 1 día · Sheep also enter in colloquial sayings and idiom frequently with such phrases as "black sheep". To call an individual a black sheep implies that they are an odd or disreputable member of a group. This usage derives from the recessive trait that causes an occasional black lamb to be born into an entirely white flock.
