The risin and tannin that can be extracted from it are sought by the chemical industry.
从中提取的鞣是业上很需要的。
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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.
在水作用下, 树能够分泌一种名叫鞣酸物质, 而它把凝胶一般柔软毛变成结实、牢革。
It takes years for a skeleton to vanish, but the shoes treated with tannic acid—they won't eat them.
骸骨需要几年才能消失，但是用鞣酸处理过鞋子——海水无法吞噬它们。
Turns out, it was made from the tannic acid of gall nuts.
原来，它是用没食子（五倍子）中鞣酸制成。
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划词翻译
详细解释
鞣
是
业上很需要的。
能够分泌一种名叫
把凝胶一般柔软
