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洞：透彻。形容观察事物非常清楚，好象看火一样。
[as clearly as a blazing fire;see very clearly as through looking at fire] 形容对事物观察得清楚明白,就像看火一样 老祖台察吏安民,洞若观火。——清· 钱谦益《致郎制台》
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