Example sentences of "[prep] [noun pl] over a long period " in BNC.

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1 Firms with a sustained high level of exports over a longer period may provide further figures for consideration as a consistent exporter .
2 The examination of all the images produced during a particular period or of a selection of images over a longer period will often provide a good idea of how the relevant state or regime wished to represent itself .
3 It will be difficult or impossible to establish a course of dealing on the basis of a small number of transactions over a long period .
4 The 30-nation talks in Geneva failed to bridge the gap between countries such as Germany and the Nordic states , which are seeking a 79 per cent cut in emissions by the end of the decade , and those like the UK and France which want a lower level of cuts over a longer period .
5 The main difference , though , was that while Pompeii was obliterated by the steady accumulation of ashes over a long period , perhaps as much as two days , Herculaneum was overwhelmed in a matter of minutes , possibly well after the eruption proper had ceased .
6 This may apply to a particular period or it may be concerned with changes over a long period of time .
7 They have given staff in schools the space to meet as a group and get to terms with issues over a longer period , complementing the series of other meetings and team meetings that go on anyway .
8 The reason may lie in what happens to the teachers themselves when they first encounter it , rather than in the use they make of it directly with children over a long period .
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