Example sentences of "have [vb pp] over a long period " in BNC.

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1 Also the junction between the uncorroded metal and the applied patina is very sharp , whereas a patina which has developed over a long period of time will have eaten into the metal in a very irregular and quite characteristic manner that is very difficult to imitate .
2 Figure 18.4 shows , by means of five-year moving averages of deaths per million in England and Wales , how the disease has behaved over a long period in relation to other serious illnesses .
3 Even at the primary stage , it has been shown that children can often grasp that a country house contains material that has accumulated over a long period .
4 But what I am saying in context , no this has a deal to do with the co boundaries , as you know erm the honourable member well knows , the essence of this this is wholly inappropriate in terms of erm trying to latest citizenship through an arrangement of six additional boundaries into a erm union and a political state and I think that that is the profound objection that this side of the house has expressed over a long period of time now , is a reflection of the public mood in the country in respect of this election and the way the boundaries er are are erm apportioned and all I say in conclusion is that this is an evidence further of the irrelevance of this house in reflecting and attesting to public opinion outside .
5 Your own , personalized weight control programme has not been a sudden thing but has evolved over a long period of time .
6 The interior cooling recorded by contraction at the surface must have persisted over a long period .
7 Scientific examination has shown that they are made of bronze similar to that used in genuine Italic figures from Italy and the patination appears to have developed over a long period , suggesting that they are not modern copies .
8 Within the orbit of the late Roman world , Christianity was primarily receptive ; it inherited a set of institutions ready-made , conformed to a social and political structure which had developed over a long period , and learned to live with a culture which it had little part in creating .
9 What was less obvious was the effect on the system as a whole , which had evolved over a long period of time influenced by a variety of political and economical pressures , and not necessarily in a methodical manner .
10 The final separation may mean an agony of divided loyalty for the children of the marriage or it may spell relief from intolerable tensions which have developed over a long period .
11 Besides , the variations in the pattern and emphasis of such courses seem to have grown up largely pragmatically , as a function of the organizational ‘ discretion ’ that both institutions and academics have in responding to the needs , pressures and priorities they have perceived over a long period of time .
12 If we find that magnets attached to cats will upset their ability to find their way home , then we are beginning , very dimly , to understand the amazing homing abilities that the animals have evolved over a long period of time .
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