了如指掌 [liǎo rú zhǐ zhǎng]
[了如指掌]成語解釋
了：明白；指掌：指著手掌。形容對事物了解得非常清楚，象把東西放在手掌里給人家看一樣。
[了如指掌]成語出處
《宋史·道學傳序》：“命於天而性於人者；瞭若指掌。”
[了如指掌]成語造句
對於潼關附近的形勢，他尤其了如指掌。
[了如指掌]百科解釋
【釋義】：了：明白；指掌：指著手掌。形容對情況非常清楚，像指著自己的手掌給別人看。 更多→ 了如指掌
[了如指掌]英文翻譯
know as one know his ten fingers; know as well as a beggar knows his bag; know like a book; have sth.at one's fingertips