读报
登录注册网站首页
 

SCIENCE STUDY

Why did tires change color?

作者:teen
Aa
  • -   
  •    +
轮胎为什么是黑色的?

Take a look at the cars in the street. What color are their tires (轮胎)? They are all black. Do you know why?

点击阅读全文
联系我们  |  诚聘英才  |  关于我们  |  版权声明
© i21st.cn   京ICP备2024066071号-1
 
选择报纸
选择报纸
关闭