This expression refers to encounters between ships of hostile nations. One ship might fire a shot at another, not in order to hit it, but to warn it to move.
这个表达源于敌对国船只在海上相遇时，一方可能向另一方鸣炮，不是为了击中目标，而是警告其快速离开。
If controller is linked with alarm output and network fire control expansion board, it can also drive alarm annunciator calling to deter crime and warn the security guard.
如果控制器接了报警输出及消防联动扩展板，还可以现场驱动报警器鸣叫，威慑犯罪人员和提醒保安赶来。
Even at a distance, odors can warn us of2 trouble - spoiled food, leaking gas, or fire.
即使还隔着一段距离，气味就能提醒我们注意很多麻烦：变质的食物，煤气泄漏，或是火灾。
A system to detect and warn the dangerous gas in the fire ground is researched and developed.
介绍了一个火场内有害气体探测预警系统的设计和实现。
A fire started when she was sleeping. Their dog barked to warn her of the danger but she couldn't hear it and she came to her death.
她睡觉的时候起火了他们的狗叫着，想警告她危险，可她没有听见，结果被烧死了。
A fire started when she was sleeping. Their dog barked to warn her of the danger but she couldn't hear it and she came to her death.
她睡觉的时候起火了他们的狗叫着，想警告她危险，可她没有听见，结果被烧死了。
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