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

三面陡峭悬崖外加山顶让这座堡垒坚不可摧。

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

没有保安在场，因为他们相信虚假技术防御坚不可摧。

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

一座非常优秀地工事可谓坚不可摧。

He was not so young as to be absolutely without a sense that sympathy was demanded, he was not old enough to be free from the terror felt in childhood at beholding misery in adult quarters hither-to deemed impregnable.

他没有年幼到缺少那种同情感觉，可他还有大到足以摆脱孩子见到他一向认为很坚强大人苦恼万分时恐惧感。

" Harry - we've just got to grit our teeth and do it, " said Ron on Friday morning, in a tone that suggested they were planning the storming of an impregnable fortress.

“哈利——我们必须咬着牙豁出去了。”期五时候，罗恩说道，听他口气就好像他们正在计划攻破一座固若金汤要塞。

" 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。

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

而且，关于这些最近提到大鲸，它们有两个坚固堡垒，就是尽人类之所能，也将永远牢不可破。

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。所以他们认为可以枕无忧。挂上门链，插上门闩，来就以为坚不可摧了。

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.

这是一个被坚不可摧城墙所围绕城市，由一个神秘莫测、令人生畏看门人把守着。

The heights of Kennesaw were impregnable.

肯尼萨山地是坚不可摧。

An impregnable castle in the center of Europe.

成为了欧洲中心坚不可摧城堡。

No one knew anything about his family. While the society of up-country Georgia was not so impregnable as that of the Coast aristocrats, no family wanted a daughter to wed a man about whose grandfather nothing was known.

尽管佐治亚内地社会并不像海滨贵族社会那样难以接近，可是也没有哪个家庭愿意让自己女儿媳给一个来历不明男人。

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堡垒崩溃声音仍在她心中回响，好像在她耳旁轰隆一声坍塌了。

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

它长盛不衰秘诀之一是它看似坚不可摧城墙。

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

城堡坚固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堡垒。

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

其中存在问题之一是它几乎坚不可摧。

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族从这个固若金汤两栖城市统治着这里。