Most adults have 32 teeth called permanent or secondary teeth; 8 incisors, 4 canines, also called cuspids, 8 premolars, also called bicuspids, 12 molars, including 4 wisdom teeth whereas children have 20 teeth.

大多数成年有 32 颗，称为恒或副；8 颗门，4 颗尖也叫犬，8 颗前磨，也称为双尖，12 颗臼，包括 4 颗智，而儿童有 20 颗。

You wished for your child to have all permanent teeth.

你多希望孩子的都换成了恒。

In the lab, adult teeth soaked in white wine for a day suffered a loss of both calcium and a mineral called phosphorus to depths of up to 60 micrometers in the enamel surface, which the researchers say is significant.

实验室中，浸泡在白葡萄酒中的恒（成年）60微米的表层釉质中出现了钙元素和矿物元素磷的流失。研究员称这种腐蚀程度算是严重的了。

Permanent means " lasting, " and these second or permanent teeth ought to last you all the rest of your life.

“恒”就是“持久”的意思, 而这第二批或者说恒将会在你随的生命中一直与你相伴。

I still had baby teeth, and I had my teeth pulled so that the adult teeth could come in.

还有乳，把拔了，这样恒才能长出来。

As your baby teeth feel those adult teeth growing in behind them, their root dissolves and they fall out.

当你的乳感觉到面恒在生长，它们的根部开始溶解，它们就脱落了。

Your teeth are kind of precious in terms of, you know, once you have your permanent teeth you don't get new ones.

你的很珍贵，你知道，一旦你长出了恒，就不会再有新的了。

And it's here, thanks to stem cells, that the same tooth-growing process repeats to form your permanent teeth.

因为干细胞，同样的制造过程就在这里重复发生，直到你长出恒。

By the time your baby teeth came in, your permanent teeth were already growing in behind them.

当你的乳长出，你的恒就接着在面继续生长。

But after those adult teeth grow in, all the stem cells that laid down the crystal nanorods self-destruct, so that's the only set of replacement teeth you get.

但当这些恒长出，所有生成纳米结晶体的干细胞就会自消亡，所以你只能有这一副替换。

Permanent teeth, I guess, or your adult teeth.

猜是恒，或者说你的成。

I hope your grown-up tooth grows in fast.

希望你的恒能快点长出来。

You're with News Hour, and while many species can regenerate their teeth, human beings only get one chance at growing a healthy set of adult pearly whites, and that is until now.

您正在收看的是新闻时间节目。 虽许多物种能够再生，但类一生只有一次机会长出一副健康的成恒，不过这一现状即将改变。

That can be caused by not enough food, so a time of famine, but it can also be caused by periods of childhood illness as your adult teeth are forming.

这可能是由于食物不足，比如饥荒时期，也可能是由于童年时期患病，导致恒发育期间受到影响。

And by the time your baby teeth came in, your permanent teeth were already growing in behind them.

当你的乳长出来的时候, 你的恒已经在它们面长出来了。

I've got seven permanent teeth that still haven't come in.

有七颗恒到现在都没长出来。

As we mature, our baby teeth drop out, replaced by adult teeth.

当们长大，乳脱落，取而代之的是恒。

I'm saying you have the same amount of adult teeth as you have kid teeth, right?

说你长出来的恒数量和你原来的乳数量一样，对吧？