（医生）能说出医理却不理解前人处方用药的意图，所以医生们大多不使用这些方剂，这也是不足为奇的。脉象缓而浮，这是中风病（外感风邪所致的表虚证），所以患者会有怕风、怕冷、发热等症状，张仲景用桂枝汤（Cinnamon Twig Decoction）来对应治疗。脉象浮紧而涩，这是伤寒病（外感寒邪所致的表实证），所以患者会有头痛、发热、身体疼痛、腰痛、骨节疼痛、怕冷、无汗且喘息等症状，张仲景用麻黄汤（Ephedra Decoction）来对应治疗。至于中风病出现脉浮紧，或者伤寒病出现脉浮缓的情况，张仲景都用大青龙汤（Major Blue Green Dragon Decoction）来对应治疗，为什么呢？我曾经深入探究其中的旨意，如果证候与脉象相对照，没有不随手治愈的。为什么这么说呢？风邪伤害卫气（防御外邪的气），寒邪伤害营血（运行于脉中的营养之血）。营血行于脉中，卫气行于脉外。风邪伤害卫气，则风邪干扰阳气，导致阳气不固，发散而为汗，因此出现自汗，这是表虚，所以张仲景用桂枝来发散邪气，用芍药（White Peony Root）来调和血液。大概中风病，病变在脉之外，其病……
(Physicians) who can articulate medical principles but do not understand the rationale behind previous physicians' prescriptions and herb usage will therefore rarely use these formulas, which is hardly surprising. A pulse that is slow (Huan) and floating (Fu) indicates Wind Strike (Zhong Feng, an exterior deficiency syndrome caused by wind pathogen); thus, the patient experiences aversion to wind, chills, and fever. Zhang Zhongjing prescribes Guizhi Tang (Cinnamon Twig Decoction) to treat this. A pulse that is floating, tight, and choppy indicates Cold Damage (Shang Han, an exterior excess syndrome caused by cold pathogen); thus, the patient experiences headache, fever, body pain, lower back pain, joint pain, aversion to cold, absence of sweating, and wheezing. Zhang Zhongjing prescribes Mahuang Tang (Ephedra Decoction) to treat this. As for cases where Wind Strike presents with a floating-tight pulse, or Cold Damage presents with a floating-slow pulse, Zhang Zhongjing prescribes Da Qing Long Tang (Major Blue Green Dragon Decoction) for both. Why? I have deeply investigated the underlying principles. If the symptoms correspond accurately with the pulse, recovery follows immediately. Why is this so? Wind damages Wei Qi (Defensive Qi), while Cold damages Ying Blood (Nutritive Blood). Ying Blood circulates within the vessels, while Wei Qi circulates outside the vessels. When wind damages Wei Qi, the wind pathogen interferes with Yang Qi, causing it to become insecure and disperse as sweat; hence, spontaneous sweating occurs. This represents Exterior Deficiency. Therefore, Zhang Zhongjing uses Guizhi (Cinnamon Twig) to dispel the pathogen and Shaoyao (White Peony Root) to harmonize the blood. Generally, in Wind Strike, the pathology lies outside the vessels, and the disease...