第二十二课

Unit 6 第六单元   Technology and Life技术与生活

1. Science and technology have created a rich and colorful material world.科学技术创造了丰富多彩的物质世界，

2. Promotes the development of human civilization.推动着人类文明的发展。

3.  Let us enter into the products of science and technology.让我们走进科技产品，

4. Feel the convenience, speed and comfort brought by scientific and technological products.感受科技产品带来的便利、快捷和舒适。

22  The learning of brakes刹车的学问

1. Questions and guesses问题与猜测

2. Why can a moving bicycle be braked?行驶中的自行车为什么能被刹住？

3.  Investigation and Practice探究与实践

4. What are the parts of a bicycle's braking mechanism?自行车的刹车装置包括哪几部分？

5. The control part, transmission part and braking part make up the braking system of a bicycle.控制部分、传动部分、制动部分组成了自行车的刹车系统。

6.  How does the braking system of a bicycle work?自行车的刹车系统是怎样工作的？

7. The wheels turned up.车轮转起来了。

8. After pressing the hand brake, I found the brake pads ------按动手刹后，我发现刹车片······

9. Think navigation思维导航

10. What scientific principle is utilized in the braking part of the brake system?刹车系统的制动部分利用了什么科学原理？

11. Where are the brake pads located?刹车片在哪些位置？

12. What material is used for the brake pads?刹车片选用的是什么材料？

13. How are the control part and the brake part connected?控制部分和制动部分是怎样连接的？

14. Expansion and Innovation拓展与创新

15. Understand the braking system of a car.了解汽车的刹车系统。

16. Which part is equivalent to the braking part of a bicycle?哪部分相当于自行车的制动部分？

17. piston, brake pad, front wheel, brake disc, piston, brake fluid, rear wheel, piston活塞、刹车片、前轮、刹车盘、活塞、刹车油、后轮、活塞