请简述机车信号应变时间的含义。
["\uff081\uff09\u4e0a\/\u4e0b\u884c\u5f00\u5173\u7535\u8def\u6545\u969c\uff1b\uff082\uff09\u524d\u540e\u7aef\u5207\u6362\u7535\u8def\u6545\u969c\uff1b\uff083\uff09\u4e3b\u673a\u6545\u969c\uff1b\uff084\uff09\u63a5\u6536\u7ebf\u5708\u6545\u969c\u6216\u63a5\u7ebf\u9519\u8bef\uff1b\uff085\uff09\u5730\u9762\u4fe1\u53f7\u6545\u969c\uff086\uff09\u7535\u7f06\u6216\u63d2\u5934\u6545\u969c\uff1b"]