Impregnable force金汤力;金
impregnable pass雄关
Impregnable Fort无坚不摧
impregnable bulwark坚不可摧的力量或防御物
impregnable a攻不破的
impregnable E征服不了的
Solid Impregnable固金汤
Impregnable Fortress铜墙铁壁;金城汤池的略语
impregnable quadrilateral坚不可摧的四边形
ADJ（形容词） 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; 坚不可摧的
The old Dutch fort with its thick high walls looks virtually impregnable.
该座荷兰老城堡城墙又高又厚，看上去固若金汤。
ADJ（形容词） 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; 无法撼动的
...the company's impregnable market position.
...该公司无法撼动的市场地位。
ADJ（形容词） able to be impregnated; fertile 可受精的; 可生育的