Example sentences of "[vb -s] over a period of " in BNC.

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1 Now it seems that the disease builds over a period of years .
2 If the water coming out of taps ( mainly hot ones ) slows over a period of time , the problem is likely to be scale in the pipes — especially if you have a direct hot water system ( see page 48 ) .
3 It is recommended that their training stretches over a period of about 15 months from the time that they take up their post .
4 This new venture aims over a period of three years to train up to ninety students not only as teachers of BSL but as BSL English interpreters .
5 If this dominance continues over a period of years though , how often does the feeling creep up on you that you 'd like to see this champion really tested , even beaten ?
6 One of the advantages of using drama in this way ( when the narrative continues over a period of several weeks ) is that both the teacher and the children can change roles , enabling us to look at any given topic from different points of view .
7 As we mentioned earlier , once a logogen reaches threshold , its activation level does not immediately return to its normal resting level ; it decays over a period of a second or so .
8 Also , short term memory decays over a period of time .
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