Example sentences of "[be] [prep] a period [prep] [noun sg] " in BNC.

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1 If two systems have been for a period of time in dynamical isolation from each other , then a measurement on the first system can produce no real change in the second .
2 The view that the major industrial nations are in a period of transition — at the end of a long period of industrialism and entering a new phase of post-industrialism — pre-dates the onset of deindustrialization and the debates around the issue .
3 This sort of placement or residency would be for a period of time , perhaps weeks or months , so there must be a commitment of time as well as purpose on the part of the artist .
4 If so , it would surely only be after a period of mourning .
5 Withdrawal should be over an period of time to allow the Northern Irish time to establish a new form of government .
6 After the storm of the breakdown , Europe is in a period of convalescence , perhaps sedated convalescence .
7 Twelfth-century Germany was in a period of expansion ; the population was increasing rapidly , agriculture and trade were booming , and towns were growing substantially .
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