每日短语—Know something back to front

Know something back to front

了如指掌

你是计算机学方面的专家。你对电脑了如指掌。

She is fluent in five languages. She knows English back to front.

她能流利地讲五种语言。她讲英语游刃有余。

这是Kylin最爱的游戏。他对其了如指掌。