读报
登录注册网站首页
 

Good books

Morse code

作者:21ST
Aa
  • -   
  •    +


IMAGINE living 160 years ago. At that time, there were no telephones, and no Internet either. If people wanted to communicate, they had to write letters. The letters reached faraway places by boat or by a wagon (四轮马车) pulled by horses. This often took a long time.
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