Example sentences of "[am/are] [vb pp] over a [adj] period " in BNC.

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1 It is currently estimated that , for every £100 million invested in trunk road improvements , about 100 road deaths and 4,500 casualties are saved over a 30-year period .
2 In this type of study , trend values of consumption and income are collected over a long period of time so that most cyclical fluctuations are smoothed out .
3 As the ice slowly melts the plants are watered over a long period .
4 The share quotation list in the Defence commodity market is the Ministry 's Long-Term Costing , in which all programmes and projects are costed over a ten-year period .
5 We shall remove tax distortions , require in-house services to be clearly costed and accounted for , and ensure that one-off costs are appraised over a realistic period .
6 By taking account of business and other operational plans , such as changes in working practices , projections are made over a five-year period to provide base information against which to evaluate alternative strategies on staffing requirements and costs .
7 It points out , however , that decommissioning costs are spread over a long period , while those of reprocessing spent fuel are more immediate .
8 This is seldom needed for analysis purposes but random access mode is often used where the records are held over a long period and have to be updated with the passage of time .
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