形容词
中文翻译：不可导航的
同义词：
['inaccessible', 'unreachable', "inoperable例句：1. The river is so deep that it's unnavigable by any boat.（这条河太深了，任何船只都无法航行。）"]
例句：
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1. The river is so deep that it's unnavigable by any boat.
这条河太深了，任何船只都无法航行。
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2. The mountain was too steep to climb without proper equipment, making it an unnavigable challenge for many hikers.
这座山太陡了，没有适当的装备就无法攀登，对许多徒步旅行者来说是一个难以克服的挑战。
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3. The old map was unnavigable, and we had to consult a new one.
旧地图无法使用，我们不得不查阅新的地图。