2018-2019学年译林版高中英语选修7课件(江苏省专用):Unit1《Living with technology Reading》2
2018-2019学年译林版高中英语选修7课件(江苏省专用):Unit1《Living with technology Reading》2第3页

Important phrases

the evolution of video and sound devices shortly afterwards contributed to the development of TV. was very primitive and had many drawbacks made important breakthroughs in the development of the TV in the late 1920s and early 1930s adopt many of the principles