1.It was the enemy's boast of impregnability that caused their own defeat .
敌人自我吹嘘战无不胜，这最终导致了他们自己的失败。
2.The need to be seen protecting the home front has apparently extended political impregnability over another big chunk of the federal budget.
让民众看到保护家园的需要，显然使政治坚盾延伸到了联邦预算的另一大项上。
3.The second, control of solid content of size can finely control size loading of strand, and then impregnability of strand is improved.
浸润剂固含量的控制也可以很好地控制原丝的含油率，从而改善原丝的浸透性；
4.Having got a feel for the impregnability of this Southeast China Great Wall,
旁白：感受过了江南长城的险要，