Example sentences of "[vb pp] [prep] [art] long period [prep] " in BNC.

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31 Your own , personalized weight control programme has not been a sudden thing but has evolved over a long period of time .
32 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 .
33 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 .
34 Such factors may include , for instance , a previous experience of loss which was dealt with badly , unresolved grief , past experience of failure , a lack of a sense of self-efficacy , a low self-esteem , a previous history of psychiatric disorder , and an absence of close relationships established over a long period of time .
35 All your behaviour , with the exception of those reflexes that were built into the system , has been acquired over a long period of ad hoc learning .
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