The risin and tannin that can be extracted from it are sought by the chemical industry.
从中提取的松香学工业上很需要的。
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It takes years for a skeleton to vanish, but the shoes treated with tannic acid—they won't eat them.
骸骨需要几年才,但是用酸处理过的鞋子——海水无法吞噬它们。
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, 树皮够分泌一种酸的物质, 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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