Example sentences of "[to-vb] [adv] a [adj] period " in BNC.

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1 There are two broad categories : ( 1 ) where the object is to generate more work by some system of cross-referral in particular fields , though such arrangements are difficult to sustain over a long period if member firms wish to retain their independence and separate profitability .
2 Ectothermic reptiles have a body temperature that tends to vary over a 24-hour period , and hence seem unable to support a large brain .
3 On June 22 , West Germany agreed to restructure over a 14-year period a debt of DM3,000 million due for payment by March 1991 .
4 The idea would be to compile over a short period a national register of wealth holdings .
5 Another modification of the model assumes that uniform extension occurs but takes account of the fact that stretching of the lithosphere is likely to occur over a long period of time , probably several million years .
6 The document says that three of the four Government proposals for new councils would cost between £500 and £1,400 to introduce over a five-year period .
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