习惯用语who iswho(=who's who)1.知道某一范围内所有的人是谁(It took the new teacher a few days to remember who was who in the class. 这位新教师花了几天时间记住班上学生的名字)2.名[要]人, 有影响人士Who's Who1.名人录, 名人词典