The sheer cliffs on three sides and the steep summit made the citadel virtually impregnable.

三面陡峭悬崖外加高耸的山顶让座堡垒坚不可摧。

There were no security guards present because they trusted the false technological defenses were impregnable.

没有保安在场，因为他们相信虚假的技术防御坚不可摧。

An impregnable castle in the center of Europe.

成为了欧洲中心坚不可摧的城堡。

It's a stunning example of architectural engineering at altitude, and completely impregnable.

一座非常优秀的高地工事可谓坚不可摧。

The tippler brought his speech to an end, and shut himself up in an impregnable silence.

酒鬼说完以后就无论如何都不再开口了。

It is a town surrounded by an impregnable wall and governed by an inscrutable, imposing Gatekeeper.

一个被坚不可摧的城墙所围绕的城市，由一个神秘莫测、令生畏的看门把守着。

The heights of Kennesaw were impregnable.

肯尼萨山的高地坚不可摧的。

" Ashamed of drinking! " The tippler brought his speech to an end, and shut himself up in an impregnable silence.

“我羞愧我喝酒。”酒鬼说完以后就再也不开口了。

Four floors up. That's why they think they're safe. Put a chain across the door, bolt it shut, think they're impregnable.

四层楼高。所以他们认为可以高枕无忧。挂上门链，插上门闩，反锁起来就以为坚不可摧了。

One of the secrets of its longevity  was its seemingly impregnable walls.

它长盛不衰的秘诀之一它看似坚不可摧的城墙。

The keep's formidable walls and defensive features make it a virtually impregnable fortress.

城堡坚固的城墙和防御工事使其几乎坚不可摧。

Fort Knox was built to be an impregnable fortress.

诺克斯堡建造成了一座坚不可摧的堡垒。

And one of the problems with it was that it was almost impregnable.

其中存在的问题之一它几乎坚不可摧。

Santa Cruz was thought to be impregnable.

圣克鲁斯被认为坚不可摧。

So the R'hlas have ruled from this impregnable amphibian city.

所以，R'hlas族从个固若金汤的两栖城市统治着里。

Around these camps hidden pits and traps were made, so that the positions seemed impregnable.

在些营地的周围，隐藏着深坑和陷阱，使阵地看起来坚不可摧。

In the 16th century, the Genoese built this impregnable citadel, with sturdy fortifications that remain intact.

在16世纪， 热那亚建造了座坚不可摧的城堡，其坚固的防御工事至今仍保存完好。

Furthermore: concerning these last mentioned Leviathans, they have two firm fortresses, which, in all human probability, will for ever remain impregnable.

而且，关于些最近提到的大鲸，它们有两个坚固的堡垒，就尽类之所能，也将永远牢不可破。

That is that there is no such thing as an impregnable door, whether front, back or side.

即无论前门、后门还侧门，都不存在坚不可摧的门。

There still reverberated in her mind the crashes of the two impregnable citadels of her life, thundering to dust about her ears.

她生活中两个坚不可破的堡垒崩溃的声音仍在她心中回响，好像在她耳旁轰隆一声坍塌了。