The Sahara is an impenetrable desert for me.

撒哈拉沙漠对我来讲是无法穿越的沙漠。

In the process of pursuing her dream, gender has become an impenetrable barrier.

在她追求梦想的过程中，性别成了她无法跨越的障碍。

The FED's policy is impenetrable.

美联储的政策令人费解。

The Caucasus range is an almost impenetrable barrier between Europe and Asia.

高加索山脉是欧亚之间一道坚不可摧的屏障

The complex is surrounded by vast impenetrable jungle.

这个建筑群被一大片密不透风的丛林包围着。

His philosophical work is notoriously impenetrable.

他的哲学著作是出了名地令人费解。

Their jargon is impenetrable to an outsider.

他们的行话外人听不懂。

The familiar chestnut, oak, and elm grew taller here, and the forest rimming the clearing appeared thick and impenetrable.

熟悉的栗树、橡树和榆树在这里长高了，空地周围的森林显得茂密而密不透风。

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。

I thought it was impenetrable.

我觉得太费解了。