敌人到来时，火和炮被同时点燃，来提醒其他城楼的士兵。

When the enemy came, fires were lit and at the same time guns were fired to warn soldiers at other towers.

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对于这种方法，这是非常重要的整个燃烧表面的粮食同时点燃。

For this method, it is important that the entire burning surface of the grain ignite simultaneously.

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比如1958年，篝火里溅出的火星把我们所有的烟火同时点燃。

There was 1958, for example, when that spark from the bonfire sent all our fireworks up at once.

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