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Thesis
Read through modern tea science, “茶有九难一曰造二曰别三曰器四曰火五曰水六曰炙” is not a lab result but a set of variables: cultivar, soil, light and plucking standard.
Text
“Tea has nine difficulties: the making, the judging, the vessels, the fire, the water, the roasting, the grinding, the brewing, and the drinking.”
Context
九难：制茶九大难处。造：制造。别：鉴别。器：器具。火：火候。水：择水。炙：烤茶。末：碾末。煮：煮茶。饮：饮用。
Evidence
- Collation: 此句为全书茶道总纲，各本一致，被历代茶书奉为"九难"之祖。
- Existing readings: 吴觉农评"九难"为《茶经》的茶道体系骨架：从造到饮九个环节缺一不可，环环皆须讲究——这是中国茶道最早的"全过程管理"思想，影响宋明清直至今日。
Analysis
Modern tea science would split “茶有九难一曰造二曰别三曰器四曰火五曰水六曰炙” into cultivar, soil, light and plucking variables. 吴觉农评"九难"为《茶经》的茶道体系骨架：从造到饮九个环节缺一不可，环环皆须讲究——这是中国茶道最早的"全过程管理"思想，影响宋明清直至今日。 They remain testable, but only with their conditions attached.
Conclusion
The section does not give a universal rule. It demonstrates a method: read the text, the annotation and the Tang context together before making a modern claim.
Source: The Classic of Tea, Chapter VI · The Drinking, section 6; the original is in the public domain.
Experience should be explained, not mystified.