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《Reading(2)：The evolution of video and sound devices》精品教案优质课下载
Step 1 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
constructed the first colour TV
regular colour TV broadcasts were delayed
within a short time
Satellites allow live TV programmes to be broadcast
over vast distances
make TV accessible to people who live far away from cities
throughout the countryside and the remote areas
a small percentage of people
benefit from satellite TV
broadcast the signals
made the first recording of a human voice
used round tubes to record on
used discs as alternative to tubes
be wound up by hand
Times sure have changed!
employed steel tape to record on
paper tape also tore easily