Much later, it was found that boiling skins in water with bark from certain trees made the leather even softer.
再后来发现，把毛皮和某几种特定的树皮放到水中一起煮，可以让皮革变得更柔软。
Exactly speaking, the raw materials are not only paper, but also gold foil, silver foil, bark, leaf, leather, cloth or fur.
没错来说，不仅是原材料纸张，而且金箔，银箔，树皮，叶，皮，布或毛皮。
Rhizophora bark produces very fine tannin suitable for leather work.
Rhizophora树皮能够生产出很好的、适用于皮革鞣制的单宁。
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