Sentence examples for challenging does occur from inspiring English sources

It means that when something challenging does occur, the pilots will have very little experience to draw on as they try to meet that challenge.

Central resetting is not a common feature of orthostatic challenge, but does occur during aerobic exercise, resulting in attenuation of parasympathetic and predominance of sympathetic heart rate control (Macor et al. 1996; Spadacini et al. 2006), analogous to what we report in this study.

Inclusion though seldom happens, possibly because of methodological challenges, and when it does occur the different forms of evidence are often kept separate.

This does occur.

That does occur.

Voter fraud does occur.

Another annotation challenge can be found with pseudogenes, which are rare in Drosophila but do occur.

Such episodes do occur.

What exactly did occur?

Miracles do occur.

And miracles do occur.