烟火作为信号被广泛应用于各种领域，比如在军事上，用来示意敌军的到来。

They used their fireworks as signals for many things such as signaling that another army was approaching.

youdao

烟火作为信号被广泛应用于各种领域，比如在军事上，用来示意敌军的到来。

They used their fireworks as signals for many things such as signaling that another army was approaching.

youdao