But another thing that's cool about it is that, most strontium doesn't start out as strontium.

但另一件很情是，大多数锶刚始并不是这种元素。

For one thing, there's more than one isotope — or form — of strontium.

一方面，锶同位素或形式不止一种。

But it left behind a slurry of other elements, including types of radioactive strontium, caesium, and technetium.

但它留下了其他元素，包括放射性锶、铯和锝。

And then, the strontium you eat and drink gets incorporated into your teeth!

然后，吃和喝锶会进入牙齿！

But another thing that’s cool about it is that, most strontium doesn’t start out as strontium.

但另一件很情是，大多数锶并不是以锶始。

Strontium, man: It knows where you've been.

锶，伙计：它可去过哪里哦。

It's not getting any more new calcium, so the strontium ratio is set forever.

它不再获得新钙，因此锶比例永远固定了。

The enamel coating your teeth contains lots of calcium, and strontium is like calcium in a lot of ways.

牙齿上牙釉质含有大量钙，锶在很多方面都和钙非常类似。

It’s not getting any more new calcium, so the strontium ratio is set forever.

它不再获得任何新钙，所以锶比例永远不变。

Strontium, man: It knows where you’ve been.

锶，伙计：它去过哪里。

And the common ones in glow in the dark toys are zinc sulfide and strontium aluminate.

而夜光玩具中常见有硫化锌和铝酸锶。

For one thing, there’s more than one isotope -- or form -- of strontium.

一方面，锶同位素或形式不止一种。

Both the strontium and caesium emit high levels of beta rays, a kind of ionizing radiation, as well as a lot of heat.

锶和铯都会发出大量β射线（一种电离辐射）和热量。

Your teeth hold a lot of information about your life story, and scientists are learning how to read it, thanks to the properties of strontium.

由于锶特性，牙齿包含了很多关于生活故信息，科学家们正在研究如何阅读这些信息。

All you'd need to do is let me borrow a couple of teeth, so I could measure how much of the element strontium is in them.

需要做就是借我几颗牙齿，这样我就可以测量它们中锶元素含量。

They use ytterbium or strontium – atoms that oscillate at visible light frequencies – and sync up lasers to the atomic oscillations for timekeeping.

他们使用镱或锶——以可见光频率振荡原子——并将激光与原子振荡同步以进行计时。

For example, there was the leaking of highly radioactive water in 2016, and strontium and other radioactive substances were found to have exceeded normal standard in 2018.

例如，2016 年发生了高放射性水泄漏，2018 年发现锶等放射性物质超标。

A few years ago, NIST built a strontium clock that broke the world record for precision – that’s how accurately a clock tracks atomic oscillations.

几年前，NIST 制造了一个锶时钟， 打破了世界精度记录——这就是时钟跟踪原子振荡准确程度。

Strontium aluminate is more expensive, but it has a longer persistence, which means it emits visible light more slowly, and glows longer after being energized.

铝酸锶价格较贵，但持久性较长，这意味着它发出可见光速度较慢，充电后发光时间更长。

All you’d need to do is let me borrow a couple of teeth, so I could measure how much of the element strontium is in them.

需要做就是让我借几颗牙齿，这样我就可以测量其中有多少元素锶。