The risin and tannin that can be extracted from it are sought by the chemical industry.
从中提香和鞣是化学业很需要。
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It takes years for a skeleton to vanish, but the shoes treated with tannic acid—they won't eat them.
骸骨需才消失,但是用鞣酸处理过的鞋子——海水无法吞噬它们。
Turns out, it was made from the tannic acid of gall nuts.
原来,它是用食子(五倍子)中的鞣酸制成的。
The water draws out of this bark a substance known as tannin; and the tannin changes the soft, jelly-like skins into tough, strong leather.
在水的作用下, 树皮泌一种名叫鞣酸的物质, 而它就可以把凝胶一般柔软的毛皮变成结实、牢固的皮革。
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