名词
中文翻译：信号炸弹
同义词：
['signal device', 'signal flare']
例句：
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1.The military used a signal bomb to warn the enemy of an imminent attack.
军方使用信号炸弹警告敌人即将发动攻击。
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2.During the war, they used signal bombs to communicate with each other across enemy lines.
在战争中，他们使用信号炸弹在敌后相互通信。
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3.The signal bomb was dropped from a high altitude, causing a loud boom and alerting everyone nearby.
信号炸弹从高空投放，发出巨大声响，并惊动了周围的每一个人。