了如指掌

对聂氏的秘密 了如指掌

(倒是这黑衣人) ── Previous context

“knows the Nie clan's secrets so well.”

却对大殿之事 了如指掌

(手眼通天 阿九你人不在殿前) ── Previous context

“but knew what happened there.”

对六派 了如指掌

(他身后的黑衣人) ── Previous context

“knows the Six Sects inside out.”

对很多警员的情况都 了如指掌 ？

(而且他是拿钱的秘密线人) ── Previous context

“that knew a lot about a lot of police personnel?”

能对学生们 了如指掌 对您来说并不难

(我心里已经有数了) ── Previous context

“Knowing the students inside and out wouldn't be difficult for you.”