television signals are first changed into radio waves,which
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television signals are first changed into radio waves,which are then sent from a station on earth to an orbiting satellite.
which are then怎么理解?
which are then怎么理解?
这个句子的意思是电视信号首先转换成无线电波,而无线电波接着从地球上的电台发送到运行的卫星上.
所以这个which are是个定语从句,修饰radio waves,which就指代radio waves.then跟first对应,表示然后,接下来.
所以这个which are是个定语从句,修饰radio waves,which就指代radio waves.then跟first对应,表示然后,接下来.
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