Example sentences of "[vb base] in [noun sg] over [art] period " in BNC.

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1 This gives judicial support to the view that financial statements have a limited useful life ( of less than 15 months ) and depreciate in usefulness over a period of time .
2 Change in landscape over a period T = t 2 - t 1 can be measured either by integration of fluxes or by net displacement of a system parameter ( ) .
3 increase in income over the period 1979 to 1988 .
4 Infection by lymphocystis first appears as ‘ Cauliflower ’ -like growths which gradually increase in size over a period of several weeks or months .
5 The fry are born with large black eyes , but these steadily reduce in size over a period of weeks until they are covered with a cartilaginous sheath .
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