Sentence examples for difficult to penetrate from inspiring English sources

So it's very difficult to penetrate this.

To an outsider, the conversation was somewhat difficult to penetrate.

They are difficult to penetrate in the best of circumstances.

Many find it a closed network difficult to penetrate.

And this is called external capsule, the white matter very difficult to penetrate.

He will again marshal a solid and experienced unit that will be difficult to penetrate.

This made his work more difficult to penetrate, even for his own countrymen.

Much of the eastern lowland is a swampy forest that is difficult to penetrate.

It is so difficult to penetrate, however, that you may end up tasting little but bread.

Being from south London, I found it difficult to penetrate that scene.

While the OFNS did have clients in the United States, it initially found the market there more difficult to penetrate.