Sentence examples for difficult to document from inspiring English sources

But they are difficult to document.

Similarly the beneficial distributional effects are difficult to document.

In addition, it is sometimes difficult to document ties to the slave trade.

As a result, it may be difficult to document and understand the nature of influences.

The civilian toll had been difficult to document and until then, impossible to film, let alone broadcast.

The extent of that damage is difficult to document because Indonesia's coal sector is notoriously corrupt and opaque.

"For football and baseball players, explosive muscle mass might relate to more power, but it is difficult to document that it leads to better performance".

This element is predicted to be solid at room temperature, although it is so unstable that this quality is difficult to document.

And the school improvements, while frequently confirmed anecdotally and through individual school test scores, have been difficult to document in ways that satisfy rigorous educational research standards.

The all-party inquiry said there were a huge number of initiatives in the UK and the "food aid landscape" was difficult to document.

The investigators concluded that teaching did not need to be cognitively complex and that it might be common among many kinds of animals but difficult to document unequivocally.