形容词
中文翻译：无法通过的
同义词：
['impassable', 'insurmountable', 'impenetrable']
例句：
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1. The mountain was so steep that it was impossible to climb through the pass.
这座山太陡了，根本无法穿过那个隘口。
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2. The river is too deep to cross without a bridge.
这条河太深了，没有桥是无法横渡的。
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3. The terrain was so rugged that only experienced explorers could navigate it.
地形非常崎岖，只有经验丰富的探险家才能穿越。