分，则知天地之气（亦与始刺浅之，而来血气意合）。针入二分，则知呼吸出入，上下水火之
（通过观察）分寸，就能知晓天地之气（这也与最初浅刺时，气血运行的意图相吻合）。针刺入二分深，就能知晓呼吸的出入，以及上下、水火之间的关系。
By measuring the *cun* (Chinese inch), one can comprehend the Qi of Heaven and Earth (this also aligns with the intent of initial superficial needling regarding the movement of Qi and Blood). When the needle is inserted two *fen* (one-tenth of a cun) deep, one can perceive the inhalation and exhalation, as well as the relationships between the upper and lower parts, and Water and Fire.