动词
中文翻译：围攻
同义词：
['encircle', 'envelop', 'surround']
例句：
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1. The city was besieged by the enemy for three weeks.
这个城市被敌人围困了三周。
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2. The castle was surrounded by a moat and drawbridge.
城堡周围是一个护城河和吊桥。
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3. The siege of the city lasted for six months.
这座城市的围攻持续了六个月。