Inside the tent, Ba o's wife tosses patties of dried yak dung onto the fire while her four-year-old son plays with a spool of sheep's wool.

帐篷里，巴欧的妻子往火里添着牛粪饼，4岁的儿子在一旁玩着羊毛线卷。

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To dye 100 grams of wool for example, you might need up to 50 grams of dried madder root.

以染100克的羊毛为例，你可能需要多达50克的干茜草根。

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In the carbonizing process, the wool cloth is treated with dilute sulfuric acid, dried, and then heated until the impurities are converted to carbon.

在碳化过程中，毛织物由稀硫酸处理、烘干，然后升温直至不纯物质全部碳化。

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