Exercise releases endorphins which are natural feel-good chemicals in the body.

运动可以释放内啡肽，这是一种让人感觉良好的学物质。

Iodine is a mineral naturally rich in seaweed, fish, and seafood.

碘是一种富含海藻、鱼类和海鲜的矿物质。

Don't eat potatoes and tomatoes. They'll kill you. Here, smoke this. It's 100% natural, organic substance. It's good for you. It's called tobacco. - thanks, doctor.

不要和西红柿。它们会杀了你。来，抽这个。它是 100% 的有机物质。这对你有好处。这叫做烟草。- 谢谢医生。

The mother-daughter team then mixes the bacteria with a natural algae-based substance, called a gel, and places it onto the paintings.

后，母女团队将细菌与一种名为凝胶的藻类物质混合，并将其放置画作上。

It's totally natural chemicals produced by the body and it just makes you feel relaxed, makes you feel good.

这是完全由身体产生的学物质，它只会让你感到放松，让你感觉舒适。

Chemical recycling uses enzymes, natural chemicals which cause changes in other chemicals without being changed themselves.

学回收用到酶，这是一种引起其他学物质的变却不会改变自身的学物质。

Beeswax is that natural substance that bees produce, right?

蜂蜡是蜜蜂产生的物质，对吧？

Now what are the properties of these chemicals, of these natural substances?

这些学物质、这些物质的性质是什么？

Endorphins are natural opiates made by your body.

内啡肽是人体产生的鸦片类物质。

The thing is, is titanium dioxide, it's a naturally occurring thing.

事情是这样的，钛白粉是一种存的物质。

So you're releasing pain, natural pain relievers, natural opioids.

于是你释放疼痛，自的止痛物质，的类鸦片物质。

I think that this idea that anything that's chemical, in air quotes, is dangerous and bad, and anything that's natural, in air quotes, is good for you.

我认为这种想法，即任何所谓的学物质都是危险且不好的，而任何所谓的物质都对你有好处。

This story starts with an element called Bromide, a natural substance that is harmless to humans and is formed in the water from salt.

这个故事始于一种称为溴物的元素，它是一种对人体无害的物质， 由水中的盐形成。

It's found in something called gas hydrate and, believe it or not, that's a kind of ice.

它存于一种叫做气水合物的物质中，不管你信不信，那是一种冰。

Now, it probably doesn't hurt that the diamond is the hardest naturally occurring substance in the world.

现，钻石作为世界上最坚硬的物质，这无疑为其长久保存提供了助力。

The Search for Our Natural Energy-Burner Knowing the power of DNP to literally burn through our stored (fat) energy, scientists have for decades been striving to find its natural equivalent within our bodies.

寻找我们自身的能量燃烧剂。了解DNP能够直接燃烧我们储存的（脂肪）能量的威力后，数十年来，科学家一直努力寻找我们体内与之相当的物质。

With a rating of ten on the Mohs hardness scale, which measures the relative hardness of minerals, diamonds are the hardest known naturally occurring substance.

钻石的莫氏硬度等级为 10 级（用于测量矿物的相对硬度），是已知最硬的物质。

Crude oil is a mix of complex hydrocarbons – substances found in oil, coal and gas.

原油是复杂碳氢合物的混合物——存于石油、煤炭和气中的物质。

And this step is essential to release the natural substanceswithin the lichen cell.

这一步对于释放地衣细胞内的物质至关重要。

And they began to figure out how to transfer magnetic properties to substances other than lodestone.

他们开始研究如何将磁性转移到除磁石以外的其他物质上。