The principle is like acupuncture, only fingers are used instead of needles. "But in acupuncture, the slightest difference in the angle or position of the needle will produce different effects. It would be impossible to hit an opponent's vital points so accurately in the heat of a fight," Lu Sung-chi says. "But it is possible to learn how to attack your enemy's weak spots."
「但在針灸上，下針的部位、角度只要稍有不同，效果立刻受影響，若說在打鬥過程中，手指一點就能制住對方穴道，實在不太可能」，呂松吉說：「比較可以做到的是，瞭解人體穴道分佈，與人交手時知道攻其弱處。」