The scientists found that the precursor wave front of a single photon always travels at c, like the signal velocity of large groups of photons.
科学家发现，单个光子的前驱波头一般以光速c传播，就像由大量光子携带的信号的传播速度一样。
Only when interference signals, such as wind disturbing, are removed, the real earthquake precursor information of this kind of high-frequency dithering signal can be distinguished.
这种高频信号要在排除风扰等因素后才能够找出其真正的映震前兆信息。
It is generally regarded as a precursor to choline, which is needed for the brain to produce acetylcholine, a neurotransmitter involved in nerve signal transmission and healthy brain function.
它通常被视为前导胆碱，是大脑所需要的乙酰胆碱，神经信号传输和在健康的大脑功能涉及递质。
However, you have to wonder whether some of the nightmare of sleep is often a precursor to the signal indicates that the body lesions.
不过，你是否想过，睡眠中的某些噩梦往往是预示身体病变的先兆信号。
However, you have to wonder whether some of the nightmare of sleep is often a precursor to the signal indicates that the body lesions.
不过，你是否想过，睡眠中的某些噩梦往往是预示身体病变的先兆信号。
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