名词
中文翻译：持久的毒气
同义词：
['persistent poison', 'persistent toxic gas']
例句：
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1.The soldiers were exposed to a persistent war gas that caused them to become ill.
士兵们暴露在一种持久的毒气中，导致他们生病。
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2. The chemical factory released a persistent war gas that polluted the air.
化工厂释放了一种持久的毒气，污染了空气。
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3. The military used persistent war gas to disorient and demoralize the enemy.
军队使用持久的毒气来迷惑和削弱敌人。