Taivo A Taiwan Mandarin dictionary

如臂使指

rúbìshǐzhǐ

ㄖㄨˊ ㄅㄧˋ ㄕˇ ㄓˇ

  1. 1as the arm moves the finger (idiom)
  2. 2freely and effortlessly
  3. 3to have perfect command of

Keep 如臂使指 and it comes back until you know it.

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