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。
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。
The bark was used to tan leather.
这种树皮鞣料用于制革。
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