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

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31 The two main sets of circumstances to which the Act is normally applied relate first to mental disorder and secondly to self-neglect over a long period .
32 Young people , the unemployed and women returning to work after a long period at home will have to show extra ingenuity to extract evidence of their work skills and potential from their life history .
33 Fatigue fractures , by their very nature , are more prevalent in structures that have been subject to stress over a long period of time .
34 The attempt to impose stricter limits on arms exports followed criticism at the time of the Gulf War of German weapons sales to Iraq over a long period [ see pp. 37639 ; 37471 ; 36498 ] .
35 The majority of other types of skin cancer are the result of continued exposure to sunlight over a long period of time .
36 The officer must indeed be prepared to sustain his attempts at persuasiveness over a long period of time , a matter which can pose problems , for he must be able to sense when a less conciliatory performance is warranted and a show of force , however discreet , would be appropriate .
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