名词
中文翻译：Unknown
同义词：
['post', 'fortress', 'outpost']
例句：
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1.The presidio was once a bustling military base.
这个前哨基地曾经是一个繁忙的军事基地。
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2. The soldiers were sent to the presidio to guard the border.
士兵们被派往前哨基地守卫边境。
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3. The presidio is now a museum showcasing military history.
前哨基地现在是一个展示军事历史的博物馆。