Presentation in 10 Hours I have a presentation in the next 10 hours. I have to present it in English and I am very nervous for it. It is a group presentation for 3 people. Everyone has 3 mins. I just started to prepare it few hours ago. I know for a English native speaker, it is not a big deal. But for me, I am afraid that I can't speak it very fluently. I have practiced it a lot of time but I made mistakes everytimes. Although I think I can take a note during presentation, I can't just read it all the time and lower my head, can I? But everytimes I raise my head and try to recite the content, I always forgot it and seem like a stutter. I always say ' En.... And... A....En.... And...' something like that. I think if I raise my head to look at audience, I will be worse that what I do right now. Here is my note: Today I want to talk about 3D printing and 3D modeling. What is 3D printing? 3D printing refers to create a three-dimensional object by laying down successive layers of material. So how does the 3d printer work? Well, it is quite similar to a normal printer but a little bit different. First, we don't need to put an ink cartridge into it, but instead, we need special printing materials, like plastic, rubber, or even a matel. We don't print a boring text document, but a 3d real life model which you can make it in your own computer. 3D printing is also called additive manufacturing. In our traditional industry, we always use subtractive manufacturing. So what is the difference between these two things? As we can see in the picture, Subtractive manufacturing removes materials and Additive manufacturing adds layers of material. So next, I want to talk about its application. In medical world, 3d printer can be used to print some special biological materials like hearts, ears, bones and skins. 3D printing is also very popular in fashion world. There is a fashion designer who is able to use 3d printer to print a sunglasses. And he put it on his models on fashion week. In the future, maybe s 3D printer can be used to print another 3D printer. That will be pretty cool!!!!