Sentence examples for it is exactly difficult from inspiring English sources

Indeed, it is exactly difficult circumstances that call for true leadership.

Unfortunately, no cameras were allowed (sorry ladies!) but I'm assured it was exactly as difficult (and presumably, hilarious) as you would imagine it to be.

But chucking a pill or tab into your mouth, or snorting up dust that smells like cheap washing powder (and  probably is), isn't exactly difficult, is it?

It is difficult to exactly define the formation and destruction mechanism of ozone.

At present, it is difficult to exactly estimate the accuracies of the speed measurement and the density estimate.

Therefore, it is difficult to exactly say whether the noise generated during drilling is only from the rock drilling or from the drilling unit itself.

We should note that it is difficult to exactly estimate the amount of infiltrate in a biopsy.

Numerical noise is a prevalent concern in simulation-based optimization problems, where it is usually difficult to exactly describe the objective function.

It is often difficult to identify exactly who or what leads to the rise or fall of regulatory reforms.

It is very difficult to establish exactly the minimal necessary dose for any given examination [1].

In practice, it is very difficult to estimate exactly the actual speeds of mobile terminals.