Example sentences of "difficult [to-vb] or [verb] [prep] " in BNC.

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1 That sort of relationship would be very difficult to sustain or to generalize beyond one or two individuals .
2 An alternative to water in sprays is needed in the tropics where water is often very difficult to obtain or transport to the field ; it evaporates so rapidly that the effectiveness of sprays is further reduced .
3 Long lengths are difficult to mail or send by carrier , so the kite-maker with a kite shop within reasonable travelling distance is better off .
4 Material which is difficult to understand or open to misinterpretation is a recipe for trouble .
5 They may be more difficult to breed or suffer from health problems , including major and minor illnesses , such as cribbing , windsucking , poor appetite , skin ailments , and colic .
6 This statement is difficult to refute or accept on the base of current research evidence .
7 The onward march of technological progress has given us the user-friendly sealed cassette , much more difficult to damage or tamper with — or to intervene in ( and to recreate on modern machines ) .
8 This hypothesis , although difficult to prove or demonstrate in the context of theoretical commentary , is dramatized in Thru , published some ten years earlier in 1975 .
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