The international foot measurements are based on the meter.

际英尺测量位是米。

Well the answer is grave. Or rather 'grave' as it would have been pronounced in the original French.

答案是。其实是原法语发音'grave'。 （英语词也是grave）最初，grave是测量质量际主位。

Scientists generally measure pressure with the S.I. unit of force: Newtons per area, meters squared, which is shortened to pascals.

科学家们通常用际计量位 来测量压强: 牛顿平方米，简称帕斯卡。

Making sure that we understand the system of units, international system of units, precision measurements.

确保我们理解位制、际位制以及精密测量。

For people who don't use the international units, that's 250 micrograms.

对于不使用际位人，这是250微克。

So a thousand IU can be synthesized.

因此，可以合成一千际位（IU）。

But in the official International System of Units, we use Joules.

但在正式际位制中， 我们使用焦耳。

They think the average American should be taking 9,600 international units of vitamin D3 a day.

他们认普通人每天应该摄入9600际位维生素D3。

Again, just 2,000 IUs of vitamin D3 each day was found to be protective of our telomeres.

研究发现，每日仅需补充2000际位维生素D3，就能有效保护我们端粒。

Neither even an America and written need the SI

甚至也不需要书写际位制。

SI units are the International System.

SI 位是际位制。

You can buy these little 5,000 IU vitamin Ds anywhere.

你可以在任何地方买到这些小瓶5000际位维生素D。

So 10 to 15 minutes of sun exposure will give you a thousand IUs of vitamin D. Wow.

所以，只需10到15分钟阳光照射，就能你提供1000际位维生素D。哇！

I make sure that I get enough D3, typically from the dropper, 5,000 IU per day, approximately.

我确保摄入足够D3，通常通过滴管摄取，大约每天5000际位。

That's basically a half a million international units of vitamin D3.

这基本上是50万际位维生素D3。

The University of California, San Diego hasn't seen vitamin D toxicity at 40,000 international units a day.

加州大学圣地亚哥分校表示，每天摄入40000际位维生素D并不会导致维生素D中毒。

Cause one of the things that I, so I, I was supplementing with vitamin D 5,000 I used.

因我之前有在补充维生素D，每天5000际位。

Okay, so we've got creatine D3, 1,000 IUs per day, 5,000 IUs, I guess it depends a little bit.

好，所以我们有肌酸D3，每天1000际位，5000际位，我想这有点取决于具体情况。

At the very least, You should think about taking 50,000 international units of D3 three days in a row.

至少，你应该考虑连续三天每天服用50,000际位D3。

I take 150,000 international units of vitamin D3 three days in a row if I feel like I'm coming down with something.

如果我觉得自己要生病了，我会连续三天每天服用15万际位维生素D3。