名词
中文翻译：关口
同义词：
['thriving point', 'critical point', 'strategic point']
例句：
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1. The military commander decided to reinforce the fortress at the crucial crossing of the river.
军事指挥官决定在河流的关键渡口加强要塞。
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2. The ancient city is a prime example of a strategic fortress, with its walls andtowers serving as a vital passageway.
这个古老的城市是战略要塞的一个典型例子，它的城墙和塔楼作为一个重要的通道。
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3. The fortress was a natural barrier, providing a strong defense against any potential invaders.
要塞是一个天然的障碍，为任何潜在的入侵者提供了强大的防御。