pair 一双，一对

例句：It took half an hour to pair the shoes up.
花了半个小时才把这些鞋一双一双地配成对。

peer 同龄人，同等地位的人，仔细看

例句：His engaging personality made him popular with his peers.
他迷人的个性使他深受同龄人的喜爱。