1 ADJ 牢不可破的;固若金汤的;无法攻取的 If you describe a building or other place as impregnable, you mean that it cannot be broken into or captured. 牢不可破的;固若金汤的;无法攻取的
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The old Dutch fort with its thick high walls looks virtually impregnable.
古老的荷兰城堡城墙又厚又高,看起来几乎固若金汤。
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In those impregnable mountains, the guerrillas could hold out for years.
在那些易守难攻的大山里，游击队可以坚持很多年。
SYN invulnerable, strong, secure, unbeatable
2 ADJ 不可战胜的;不可撼动的 If you say that a person or group is impregnable, or their position is impregnable, you think they cannot be defeated by anyone. 不可战胜的;不可撼动的
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