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。
A spokesman said the search and rescue mission was mounted after the jet failed to make regular radio contact.
一名新闻发言人透露，搜救任务在飞机不能进行正常的无线电联络之后就已经开始了。
Since the pulsar's regular radio and X-ray pulses have not altered, researchers suspect that the fluctuations originate in the inner portion of the nebula.
鉴于脉冲星规律的射电及X射线脉冲并未发生改变，因此学者们怀疑波动源自于星云的内层。
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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