Impossible odds. An impregnable fortress. A battle like nothing you've ever seen.

困难重重。一座坚不可摧的堡垒。一场前所未见的战斗。

youdao

No monarch in his impregnable fortress is more secure than the cony in his rocky burrow.

在巩固城堡中的王并不会比在岩石洞穴中的沙番更安全。

youdao

Despite the strength of its site, the old fortress at Dover was not impregnable.

尽管占据地利优势，多佛古堡也不是坚不可摧的。

youdao

The shells for the massive guns of this supposedly impregnable fortress were designed to destroy attacking ships, not massed infantry.

FORBES: The Fed Fiddles...

The shells for the guns of this supposedly impregnable fortress were designed to destroy attacking ships, not massed infantry.

FORBES: The Fed Fiddles...

As the legislation - seen as having been watered down compared to the initial White Paper in 1997 - made its way through parliament, Labour MP Mark Fisher described it as "an amazing defensive edifice for the government...a virtually impregnable fortress".

BBC: Will it end Britain's culture of secrecy?