形容词
中文翻译：不可战胜的
同义词：
['unbeatable', 'impregnable']
例句：
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1.The soldiers were invincible in the face of the enemy's attacks.
士兵们在敌人的攻击面前坚不可摧。
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2.The fortress was so well-fortified that even an invincible army could not breach its defenses.
这座堡垒防御得如此严密，即使是一支坚不可摧的军队也无法攻破它的防线。
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3. The champion boxer was considered to be invincible in the ring.
这位拳击冠军被认为是拳击场上无人能敌。