It was not until 1920 that regular radio broadcast began.
直到1920年才开始有定期的无线电广播。
It was not until 1920 that regular radio broadcasts began.
直到1920年才开始有了定期的无线电广播。
It was not until 1920 that regular radio broadcasts began.
直到1920年才开始正规的收音机广播。
It was not until 1920 that regular radio broadcasts began.
直到1920年才开始正规的收音机广播。
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