名词
中文翻译：信号壳
同义词：
['signal case', 'signal casing例句：1. The soldiers used the signal shell to communicate with each other during the battle.（士兵们在战斗中使用信号弹壳来互相通信。）']
例句：
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1. The soldiers used the signal shell to communicate with each other during the battle.
士兵们在战斗中使用信号弹壳来互相通信。
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2.The signal shell was fired at the enemy's position, causing them to retreat.
信号弹被发射到敌人的位置，使他们撤退。
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3. The signal shell was a crucial part of the military communication system.
信号弹是军事通信系统的重要组成部分。