But plants don’t make tannins so that humans can have long-lasting, protective clothing.

不过植物不是为了人类能有耐的皮革穿才制造宁酸的。

It's full of tannic acid which in part gives it its red colour but also helps it resist fires.

树皮中富含宁酸，这在一定程度上使它呈现红色，但也有助于帮其抵御火灾。

And if you're talking about tannin, oak imparts tannin, from the wood.

如果你说的是宁酸，橡木赋予宁酸，来自木材。

Its tannins and oils are used in treating clothes and skins and making oiled paper.

它的宁酸和油可于处理衣服和皮毛，以及制作油纸。

So, this fermentation process take two or three weeks, and sometimes even more, to get the color and the tannins out of the berries.

发酵过程需要两到三周，有时甚至更长时间，才能得到浆果的颜色和宁酸。

When acacia trees are grazed by animals, they quickly react by producing chemicals called tannins, which make their leaves unappetizing and tough to digest.

当金合欢树被动物啃食时，它们会迅速产生一种宁酸的化学物质，这种物质会使金合欢树的叶子变得倒胃口且难以消化。

They include red wine, which also contains tannins from grape skin.

其中包括红酒，它还含有来自葡萄皮的宁酸。

But if you then do that trick where you finally get two cups of tea out of the same tea bag, the second extraction will be more heavy in tannins and therefore more bitter.

但如果你那种方法， 即最终从同一个茶包中泡出两杯茶，第二次浸泡出来的茶会含有更多的宁酸， 因此会更苦。

Five more minutes.Don't want to rush those tannins.

再等5分钟, 别弄糟宁酸。

He also discovered many useful compounds, among them ammonia, glycerin, and tannic acid, and was the first to see the commercial potential of chlorine as a bleach—all breakthroughs that made other people extremely wealthy.

他还发现了许多有的化合物, 其中包括氨、甘油和宁酸, 并且是第一个看到氯作为漂白剂的商业潜力的人 - - 所有这些突破都使其他人变得非常富有。

Tea and coffee contain tannins, which are acidic polyphenols that lead to tooth discoloration.

茶和咖啡含有宁酸，这些酸性多酚类物质会导致牙齿变色。

All acidic and tannic foods can stain our teeth if consumed on a regular basis.

所有酸性及富含宁酸的食物，若长期食，均可能导致牙齿染色。