(中学篇)2019年第05期:基于主题意义的英语教学实践探究——以一节科技说明文教学设计为例(江苏:辛强)一文涉及的教学材料

 
Where Real Reality Ends
 
What is “virtual reality”?
 
Virtual reality is an artificial, three-dimensional environment, produced by a computer. Objects in virtual reality seem to have height, length and width. We can pick them up and turn them around. We can see, hear and feel things that don't exist.
 
How does it work?
 
To see a virtual world, users put on a head-mounted display (HMD) and wear a special glove.
 
1 The HMD is linked up to a computer. The computer sends and receives data to and from the HMD and the glove.
 
2 Inside the HMD, there are two tiny liquid crystal displays (LCD), one for each eye. These show slightly different images. Our brain puts the images together to make a single, three-dimensional image.
 
3 The computer also sends sounds to speakers inside the HMD. If an object moves near you, the sounds get stronger. If an object moves away from you, the sounds get weaker.
 
4 A “tracker” inside the HMD follows the movement of your head and your eyes. It sends this information back to the computer and the computer changes the images and sounds in the HMD.
 
5 If you move your hand, a special glove sends signals back to the computer and the computer changes the images in the HMD. You can see the glove in the HMD and watch how it moves. For example, you can play virtual tennis and watch how you hit the ball.
 
6 The computer needs to change the image in the HMD at least 10 times very second. For this, you need very fast, powerful computers. Today, it is easy to know the images and sounds in the HMD are not “real reality”. In the future, with bigger, faster computers, it won't be so easy to tell where real reality ends and virtual reality begins ...
 
What use does it have?
 
Today, virtual reality is mainly used in video games. In the future, we will see more uses for virtual reality. Surgeons could plan and practise an operation on a virtual patient. Engineers could test machines which do not even exist. Architects could show people around houses that have not been built and tennis players could play against opponents before the real match begins.