动词
中文翻译：Unknown
同义词：
['suddenly attack', 'surprise attack', 'unexpected attack']
例句：
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1. The enemy suddenly attacked us from the rear.
敌人突然从后面向我们发起了攻击。
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2. The sudden attack caught everyone off guard.
突如其来的攻击让所有人都措手不及。
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3. The surprise attack caught our defense system off-guard.
突如其来的攻击让我们的防御系统措手不及。