This cooling liquid formed a very hard rock known as granite.

这种冷却液体形成了种非常坚岩石，被称为花岗岩。

For one, they have a hard, mineralized layer on the outside.

首先，鳞片表面有非常坚矿化层。

And they come in their own very hard shell.

它们都有非常坚外壳。

Marble is a type of stone, it's a very strong type of stone.

大理石是种石头，它是非常坚种石头。

It's not even wooden; that's rock-solid.

门甚至不是木头做；是非常坚实心材质。

The nails on our fingers and toes are only parts of the skin which have grown very hard.

我们手指与脚趾上指甲, 只是长得非常坚部分皮肤而已。

Have you ever seen a diamond? It is a very bright, hard kind of stone, and very dear.

朋友，你见过钻石吗？钻石，也叫金刚石，是种非常光亮，非常坚石头，价钱还特别贵。

This material forms very hard ceramics that also find use in everything from car brakes to bulletproof vests.

该材料可制造非常坚陶瓷，而这种陶瓷适用于从汽车制动到防弹背心等很多领域。

So these things are really tough, and the buildings they're in are probably hardened both inside and out.

所以这些东西非常坚，它们所在建筑内外可能都加固了。

Well, the stone is a kind of very hard rock called granodiorite. It is dark grey and pink in color.

石碑由非常坚花岗闪长岩制成。石碑颜色为深灰色和粉色。

Now those letters are made of metal, so they're a very hard material.

现在这些字母是金属制成，所以是种非常坚材料。

How do you break up a really solid soil?

如何分解非常坚土壤？

You pay for a very stiff frame.

你为非常坚框架付出了代价。

You know, we have materials that are very pliable, materials that are very stiff.

你知道，我们有非常柔软材料，也有非常坚材料。

She thinks it is a very hard cupboard!

她认为这是个非常坚橱柜！

Brazil nuts have very hard shells.

巴西坚果有非常坚外壳。

A few carnivorous eat very hard food, and have specialized adaptations for cracking bones or shells.

些食肉动物吃非常坚食物，并且有专门适应能力来破解骨头或贝壳。

Cobalt is a hard, shiny metal that is often mixed with other metals. It is very rare but extremely important to the production of batteries.

钴是种非常坚、光亮金属，经常与其他金属混合存在。这种金属非常罕见，但对电池生产极为重要。

This is like a really hard plaque that discolors your teeth, and at this point, only a dentist would be able to get rid of it.

这就像是种非常坚牙菌斑，会让你牙齿变色，这时，只有牙医才能将其清除掉。

" Coal" (coal) is a very hard, black substance that you dig out of the ground to use as fuel, to use for energy.

“煤” （煤炭）是种非常坚黑色物质，你从地下挖出来用作燃料， 用作能源。