His inventions and innovations included batteries, cement mixer, the sound recording telephone, double- and multi-type cable system, railways used brakes.
他的发明和革新包括蓄电池、水泥搅拌机、录音电话、双工式和多工式电报系统、铁路用制动器等。
2
Note: If you are using a template with a recording slide placeholder, double-click the slide.
注意：如果你使用模板录制的幻灯片有点位符，双击这个幻灯片。
3
When writing, he is recording and reading himself. So he shoulders a double identity of writer and reader, and enjoys creation and appreciation.