The old Dutch fort with its thick high walls looks virtually impregnable.那座荷兰古堡高墙厚壁, 看上去几乎是固若金汤。

In those impregnable mountains, the guerrillas could hold out for years.在那些易守难攻的大山里, 游击队员们可以坚持数年。

Troy is a strong and prosperous nation based around a city whose walls have proven impregnable to attack.特洛伊是一个强盛的城邦, 中心城市的城墙坚不可破。

impregnable self-confidence不可左右的自信

The Bundesbank's seemingly impregnable position has begun to weaken.德国中央银行貌似不可撼动的地位开始动摇了。

Eisner has made himself all but impregnable to attack.艾斯纳使自己几近坚不可摧。