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一目了然了若指掌如指诸掌如数家珍旁观者清洞若观火烂如指掌知己知彼管窥蠡测了然于目一清二楚

一团漆黑一脸茫然不得而知不得要领不甚了了不知所以似懂非懂摸不着头脑疑团莫释心中无数一无所知

◎了如指掌liǎorúzhǐzhǎng

[have sth.at one’s fingertips; know as one know his ten fingers; know like a book; know as well as a beggar knows his bag] 形容对情况极为清楚

对他们的活动，他完全了如指掌