21.   Others said the genetic differences between the salmon were too minuscule to require explanation yet.

22.   The British anger at these films requires no explanation.

23.   The challenges Friday, which lawyers call peremptory challenges, generally require no explanation.

24.   The name of the new center requires explanation.

25.   The trim designations for the two cars are confusing, and require some explanation.

26.   This one might require a little explanation.

27.   Verbatim excerpts from the outline would require extensive explanations.

28.   Although such a generalized comparison requires detailed explanations, it provides an overall picture of how the golf course as a land use.

29.   Choose something slightly above their own reading level, because that will require explanations, and conversations will flow from that.

30.   For Cristina Alberdi, a Socialist member of parliament and former minister of social issues, the comment was an insult that required an explanation.