The first indication is that Tuesday afternoon's crash occurred after the metro system staff had switched to manual scheduling following a signal failure.
暗示星期二下午这场事故发生的第一个信号就是，地铁系统员工在信号指示失败后立刻转为手动操作。
Chaotic signal generator is one chaotic system which is the first part of chaotic communication and secret communication system.
混沌信号发生器是一种混沌系统，也是构成混沌通信与保密通信系统的首要环节。
The functions of the first and second signal system are found connected when basketball specialty experience forms in the nerve structure of brain cortex.
在大脑皮质区的神经结构中形成篮球专项经验时可以发现第一和第二信号系统的功能联结在一起。
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