求翻译：“播出季”这一概念的起源是美国，最早的做法是从广播网继承而来。早在20世纪三四十年代，美国各大广播网便在听众相对较少的夏季播放一些低成本节目充数；而广播网在发展电视事业之后，也沿用了这种做法，把夏季当作一个低效益的时期进行冷处理，并逐渐形成了每年以“季”为周期的运作模式。是什么意思？

Broadcast season, "the origin of the concept of the United States, the first practice inherited from the broadcast networks. In thirty or forty years of the 20th century, the major U.S. broadcast networks in the listeners a relatively small summer play some low-cost program filled up; broadcast netw

The "broadcast" season the concept of origin is the United States, and is the oldest practices inherited from the broadcast networks. As early as the 20th Century, 340 s the big broadcast networks have a smaller audience in the summer play a number of low-cost programs, number of TV broadcasting net

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"Broadcast season" is the origin of the concept of United States, come early practice was inherited from the broadcast networks. As early as in the thirties or forties of the 20th century, the United States the major broadcasting network in relatively small audience of some low-cost summer programs

“Broadcast the season” this concept origin is US, the earliest procedure is from the broadcasting network inheritance.As early as in the 20th century 340 ages, American each big broadcasting network then broadcasts some low cost program in the audience relative few summers to serve as a stopgap; But