大象传媒 Learning English - The English We Speak: To know something like the back of your hand - 大象传媒 Sounds

大象传媒 Learning English - The English We Speak: To know something like the back of your hand - 大象传媒 Sounds


The English We Speak: To know something like the back of your hand

A popular expression for letting people know you are an expert

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