No mix compounds; free to add, substitute substances or impurities
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No. 3
Availability of the most pure silk
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No. 4
Pollution-free; simple clean
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No. 5
Pure clean. Lao She's "Crescent Moon": "twilight this month, half the children into groups according to the snow white light, half of the children, slightly Huiying, showing the purity is difficult to think of." Ba Jin "Fourth Ward": "You read poetry, can make your heart pure point. "