narrow casting
... media buying service媒体购买代理 narrow casting小范围播放(窄播) preferred position首选广告版位 ...
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起初，他们或互不相识，或只是很小范围，有人带着录音机用来播放舞曲，自发地娱乐，互相学习。
At first, they did not know each other, or only in a limited scope, some with tape recorders to play dancing music, and then their own entertainment begin.
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