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Open the tool →了若指掌 (liǎo ruò zhǐ zhǎng) is a Chinese idiom (chengyu) meaning “to know something like the back of one's hand”.
了若指掌 is pronounced liǎo ruò zhǐ zhǎng in Mandarin Chinese.
了:明白;指掌:指着手掌。形容对事物了解得非常清楚,象把东西放在手掌里给人家看一样。