【似懂非懂】〖sì dng fi dng〗[not fully understand; have only a hazy notion; knowing a subject half well]

似梦初觉曾相识，

懂行好像不知底。

非常抱歉心无数，

懂懂懵懵茫若迷。

好像懂，又好像不懂。As if to understand, and do not seem to understand. 同：一知半解。反：了如指掌、心中有数。