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1·His philosophical work is notoriously impenetrable.

他的哲学著作是出了名地令人费解。《柯林斯英汉双解大词典》

2·Their jargon is impenetrable to an outsider.

他们的行话外人听不懂。《牛津词典》

3·No system is impenetrable, and none can promise to eliminate the worst case completely.

没有哪个系统是不可攻破的，也没有哪个系统能够保证完全杜绝最坏的情况发生。

4·On the other side of the rise, an endless impenetrable thicket of poison oak and coyote brush hides quail and other members of its guild.

在另一边，则生活着无边浓密的毒橡林和藏着鹌鹑的郊狼灌木丛以及其他成员。

5·With much of the built-up landscape impenetrable by water, even gentle rain runs off almost immediately from rooftops, streets, and parking lots.

由于很多建筑景观都不被水穿透，即使是温和的雨水也会立刻从屋顶、街道和停车场流下。

6·I thought it was impenetrable.

我觉得太费解了。

7·Autism is not an impenetrable wall.

孤独症不是一堵无法穿透的墙。

8·The answer most often heard in Washington is impenetrable.

在华盛顿听到的对这个问题的回答都是让人难以理解的。

9·Against a thick, impenetrable bush, and a large male lion stood.

一片茂密的灌木，一只巨大的公狮子正对在她面前。

10·Here, blonde morphs into steely resolve and impenetrable intellect.

这儿，金发变成了铁石心肠和不可捉摸的智慧的代名词。