Example sentences of "[verb] [adv] long period [prep] " in BNC.

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1 Here at last was the starting point for a science that would attempt to explain the present state of the earth and its inhabitants in terms of natural processes acting over long periods of time .
2 You 'll spend quite long periods of time working entirely alone , but study need not be an unsociable , let alone an anti-social , process .
3 Work groups differ from free-forming groups outside employment in that they evolve over long periods of time .
4 Though involving less spectacular rates of uplift , crustal unloading by denudation is a far more pervasive process which extends over long periods of time , in contrast to the rather transient effects of deglaciation and evaporation of lakes .
5 About half of the people detained under Immigration Act powers in general do not wish to challenge the decision that they should leave but they need help winding up their affairs here , contacting their friends and families and pressing the Home Office to process their cases quickly so that they do not have to spend unnecessarily long periods in prison .
6 Above all , there seemed to be little recognition of the special needs of people who were destined to spend very long periods behind bars : the long-termers were treated not very differently from the short-termers , and relatively little thought seemed to have been given to the risk of mental deterioration in an environment without stimulus .
7 Georgi Lozanov 's work is particularly apposite to memory training ; students learn a remarkable number of words at a session , with little or no forgetting over long periods of time .
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