space telegraphy

• 无线电报

space telegraphy的用法和样例：

例句

1. Wireless telegraphy, the phonograph and the radio are based on this law.
   无线电报，留声机和无线电广播都基于这个法则。
2. He experimented for years in his own laboratory,while he was still a young man, he invented wireless telegraphy.
   他在他自己的实验室里成年累月的作实验，之后，当他还是个年轻人的时候，他发明了无线电报。