1.   Given all this, the deviant cases require explanation.

2.   Nevertheless, distraction displays are, by any standards, remarkable patterns of animal behaviour, and require some explanation.

3.   Relationships between the government and the employing organisation require explanation too.

4.   So dismissive a judgment requires further explanation.

5.   The fact that Stein established a tradition of building pianos without checks requires an explanation.

6.   The traditional term will serve, even if it is one the scope of which requires further explanation.

7.   The use of the term feminism here requires explanation.

8.   The word merits requires further explanation.

9.   These are examples of the many questions about politics that require explanation, not mere descriptive facts.

10.   It was as if the presence- or absence - of a father is a minor detail, not even requiring an explanation.