Ministry of Education《Dictionary of Chinese Idioms》

Homepage〉Idiom search〉辭典附錄〉書證待考參考詞語表〉[了如指掌]

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Idiom	了如指掌(瞭如指掌)
Source	成語分類辭典(上)(下) 重編國語辭典修訂本
Ref. words	瞭如指掌
Appendix	書證待考參考詞語表