空间站到底有什么用？大家看一下液体，一半水，一半油。大家应该能够看到水和油它是不能相容的。
因为地球上有重力的存在，油比水轻，所以说它就会浮在水的上面。它们两个是融不到一起的。而这个问题。
在空间站里边就可以完美的解决，因为空间站没有重力，是一个失重的环境，就不存在谁轻谁重的问题，他们可以。
非常好的融合到一起。那把两种本来融不到一起的东西给它融到一块儿有什么用处呢？这个用处非常非常的大。因为我们生活当中所能接触到的材料。
大部分都是这种复合材料，很少有单一的材质。比如说我们经常用的铁就不是纯铁，而是铁和碳的合金。
我们管这种东西叫做钢，那不同的材料混合在一起会表现出一些特别的特性。而一些特性有的是可以为我们所用的。
但是呢在地球上，因为有重力的存在，有比重的问题，不是所有的材料都能合成在一块的。而在空间站当中就不存在这个问题。
几乎所有的东西都能给他混到一块去。但是如果我们没有自己的空间站，那可就得看别人脸色了。你想带什么东西上去，上去之后想干什么？
肯定要经过人家审批，人家同意你才能往上带，才能去上去合成。这还是在人家愿意带你玩的情况下。而事实上人家根本就不带咱们玩。
咱们连被别人刁难的机会都没有，你根本就没有机会做这样的实验。人家的实验结果也不会分享给你。而现在不一样了，我们有了自己的飞船，有了自己的空间站。
我想带什么上去就带什么上去。我上去之后想怎么混合，怎么混合，谁他妈也管不着。而且我的实验结果肯定也不会向你分享。
在太空当中能做的事还有很多很多。比如说在地面上，因为受重力的影响，我们很难加工出特别圆的圆形零件来。比如说轴承里面的滚珠。
这点误差在一般的机器设备上，我们是感受不到的。但是在一些个特别精密的设备上，比如说光刻机，那这点误差可就影响的非常大了。那除了零重力。
空间站啊还有很多很多的特点，能干的事儿非常非常的多。比如说化学、物理、空间、环境、生命科学，因为受时间的影响呢，我们只能举这么一个例子。
那空间站它有这么大的作用，为了不让人卡脖子，为了不受制于人，我们的这些个投入是值得的。那大家对他的关注也是。

What is the use of the space station? Everyone, take a look at the bottle of liquid in my hand. It is half of water and half of oil. Everyone should be able to see that water and oil are incompatible.
Because of the existence of gravity on the earth, oil is lighter than water, so it will float on water. The two of them cannot be blended together. And this problem.
It can be solved perfectly in the space station. Because the space station has no gravity and is a weightless environment, there is no question of who is heavier, they can.
Very well blended together. So what is the use of blending two things that cannot be blended together? This is very, very useful. Because of the materials we can come into contact with in our lives.
Most of them are of this kind of composite material, rarely a single material. For example, the iron we often use is not pure iron, but an alloy of iron and carbon.
We call this kind of thing steel, and mixing different materials together will show some special characteristics. And some features can be used by us.
But on the earth, because of the existence of gravity and the problem of specific gravity, not all materials can be combined together. This problem does not exist in the space station.
Almost everything can be mixed for him. But if we don't have our own space station, it depends on the faces of others. What do you want to bring up, and what do you want to do after you get up?
It must be approved by others, and only when they agree to you can you bring it up, and then you can go up and synthesize it. This is still under the circumstances that others are willing to take you to play. In fact, they didn't take us to play at all.
We don't even have the opportunity to be made difficult by others, and you never have the opportunity to do such an experiment. The results of other people's experiments will not be shared with you. But now it’s different. We have our own spacecraft and our own space station.
I bring up whatever I want. After I went up, I thought about how to mix, how to mix, no one can care about it. And the results of my experiment will certainly not be shared with you.
There are many, many things that can be done in space. For example, on the ground, because of the influence of gravity, it is difficult for us to machine particularly round circular parts. For example, the balls in the bearing.
We can't feel this error in general machinery and equipment. But on some particularly sophisticated equipment, such as photolithography machines, this error can have a very large impact. Except for zero gravity.
The space station also has many, many features, and there are many, very many things that can be done. For example, chemistry, physics, space, environment, and life sciences are affected by time. We can only cite such an example.
The space station has such a big effect. In order to prevent people from getting stuck, in order not to be controlled by others, our investment is worthwhile. So is everyone's attention to him.