Sentence examples for that is the difficulty from inspiring English sources

The paediatric population was excluded for one obvious reason, that is the difficulty to obtain the PEFR reading.

Degree of corroboration of a phylogenetic tree hypothesis is given by improbability of that goodness-of-fit — that is, the difficulty in explaining fit that good by other factors, including elements of chance, that make up our "background knowledge".

"Rather than altitude gain or temperature, it's the terrain that is the difficulty here," explained Jens Waechter, a German ultra-runner who lives in Ireland and placed second in the 2013 race.

That is the difficulty.

But that is the difficulty.

DR. SEIDL: That is the difficulty, Mr. President.

No, it's the play itself that's the difficulty: it's at the same time daft and dazzling.

"That's the difficulty of that play".

That's the difficulty we have here.

Maybe that's the difficulty you're prepared to accept.

That's the difficulty and also the insurance against mistakes.