求翻译：上世纪50年代末，美国无线商业电视起步不久，电视网出于收视和广告竞争的需要，按照受众按季收视的规律，把每年9月中旬至次年5月跨度大约40周的这段时间看成一个黄金播出季节。电视行业把这段时间叫做“正式播出季节”，这是美国一年中的收视高峰时期，也是各电视网重点争夺的黄金季节。是什么意思？

In the late 1950s, the U.S. wireless commercial television started soon, the networks need for ratings and advertising competition in accordance with the laws of the audience Quarterly ratings, mid-September each year to May the following year span of about 40 weeks this time as a gold broadcast sea

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On the century at the end of 50's, the US wireless commerical television start soon, the television network stemming from the reception of TV and the advertisement competition need, according to receives the audiences according to the season reception of TV rule, from mid-September will regard as to

The late 50, United States wireless commercial television's fledgling television network for ratings and advertising needs, in accordance with the quarterly program for all regularity in the year from mid-September to May of the following year span about 40 weeks of this period of time as a gold bro

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