1：Technology has seen some amazing developments in the past few decades. 搭配完成时态
2：Now we can record music using computers. (现在分词做方式状语，自己写作的是时候可以替换by, with 等…)
3: With mobile phone, we can keep in touch with 与…保持联络others wherever we are.
4：How have different electronic devices 电子设备 changed over time随着时间的推移?
5：long-distance TV broadcasts 远距离电视播送
6：Regular public broadcasting followed shortly afterwards. 不久之后开始定期向公众播放。
7：Many different people contributed to=make contributions to the development of TV.
