形容词
中文翻译：无法克服的
同义词：
['unbeatable', 'invincible', 'impregnable']
例句：
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1. The mountain was so steep thatit was insurmountable for mostclimbers.
这座山太陡了，大多数登山者都无法攀登。
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2. The enemy's forces were invincible, and ourtroops had to retreat.
敌军力量强大，我军不得不撤退。
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3. The castle was impregnable, with walls so thick thatno one could break through.
城堡坚不可摧，墙厚得无法攻破。