im-,不，非，pregnable,易受攻击的，词源同prehensile,插入字母g.即没法攻击的，坚不可催的。

1. The Bundesbank's seemingly impregnable position has begun to weaken.

德意志联邦银行看似不可撼动的地位开始削弱了。

2. 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。

3. 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。

4. The team built up an impregnable 5-1 lead.

这个队以5:1的绝对优势领先。

5. The lawyer won his case with an impregnable argument.

律师以无可辩驳的论据打赢了那场官司.