信号就是软件中断，可以向正在执行的程序(进程)发送有关异步事件发生的信息。
Signals are software interrupts that send information about an occurrence of an asynchronous event to an executing program, or process.
这意味着从大脑信息可能不排除再度行走瘫痪病人中断-他们还是会需要新的电信号刺激脊髓。
That means interruption of messages from the brain may not preclude paralyzed patients from walking again - they would just need new electrical signals to stimulate the spinal cord.
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