This signal is three short spurts in quick succession and means that the operator should pass the office name only and wait for another order tone.
此种信号是快速连续的三次简短爆发，其表示的是操作员只可以传送电话局的名称，然后等待其他的命令音。
Ox horn alley community the dweller discuss in succession, "the electric furnace forgot to turn off pyrrole, the wildfire all burned a building pass, very dangerous."
牛角巷社区居民议论纷纷，“电炉忘记关掉了咯，大火都烧到楼道了，很危险呢。”
Ox horn alley community the dweller discuss in succession, "the electric furnace forgot to turn off pyrrole, the wildfire all burned a building pass, very dangerous."
牛角巷社区居民议论纷纷，“电炉忘记关掉了咯，大火都烧到楼道了，很危险呢。”
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