Example sentences of "[noun] be [vb pp] over a long " in BNC.

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1 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 .
2 This experiment was conducted over a longer time period ( ten days ) , starting with young plants .
3 As the ice slowly melts the plants are watered over a long period .
4 It points out , however , that decommissioning costs are spread over a long period , while those of reprocessing spent fuel are more immediate .
5 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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