名词
中文翻译：Unknown
同义词：
['battery', 'embrasure', 'fortification', 'gun port', 'muzzle']
例句：
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1. The castle has several crenellations on the walls.
城堡的墙上有几个炮台。
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2. The soldiers were trained to use the crenellations to defend themselves.
士兵们被训练用来使用炮台来保护自己。
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3. The fortress is well-fortified with crenellations and barricades.
这个要塞有坚固的炮台和障碍物。