It would be difficult to explain why additional restrictions were needed on a "safe" weapon.
Fortunately, while fluid flow may be difficult to explain, it is beautiful to observe.
But the products are complex, and their benefits can be difficult to explain.
This argument has the added benefit is that it is quite complex and so will be difficult to explain.
And it can be difficult to explain how to use this unfamiliar toolbox of buttons, programs and devices.
It has sexual situations -- actually, the whole movie is a sexual situation -- that may be difficult to explain to children.
ONE problem with doing the right thing is that it can be difficult to explain yourself when you stop.
You have to take my word, because even to a serious mathematician this would be difficult to explain.
Otherwise, those analysts said, it would be difficult to explain why hunted Taliban leaders would expose themselves to attack.
The intricacies of Wall Street, which are often central to such matters, can be difficult to explain to jurors.
A fast-spinning pulsar, then, would be difficult to explain as anything other than a strange star.
