《伤寒论·平脉法》
老师答：医生用手指按脉，如三粒小豆一样的重量就能切得脉搏的，是肺气之脉；如六粒小豆一样的重量而切得脉搏的，是心气之脉；如九粒小豆一样的重量而切得脉搏的，是脾气之脉；如十二粒小豆的重量而切得脉搏的，是肝气之脉；重按至骨始得脉搏的，是肾气之脉。
师曰：脉者，人以指按之，如三菽之重者，肺气也；如六菽之重者，心气也；如九菽之重者，脾气也；如十二菽之重者，肝气也；按之至骨者，肾气也。
Teacher's Answer: When a doctor presses on a patient's pulse with his fingers, if the pulse can be felt with a weight of three small beans, it is the pulse of lung qi; if the pulse can be felt with a weight of six small beans, it is the pulse of heart qi; if the pulse can be felt with a weight of nine small beans, it is the pulse of spleen qi; if the pulse can be felt with a weight of twelve small beans, it is the pulse of liver qi; if the pulse can only be felt when pressed down to the bone, it is the pulse of kidney qi.