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。
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。
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