not know A from B

• 一字不识

词汇搭配

• not know B from a bull's foot 一字不识
• not know from A to B 什么都不懂; 一字不...
• not know B from a battledore 一字不识,愚昧无知...
• not know B from a buffalo 一字不识,愚昧无知...