Example sentences of "persist for many year " in BNC.

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1 It can persist for many years .
2 We found that chronic constipation in young children can persist for many years .
3 It 's a help , but not a complete solution to the problem because once chlorine has been released in the stratosphere , it persists for many years and goes on destroying ozone .
4 The process of separation and demarcation was not a rapid one , and considerable ambiguity in the use of the term ‘ farrier ’ and ‘ farriery ’ persisted for many years after the establishment of the College , reflecting the degree to which the occupation of farrier and veterinarian overlapped .
5 The solvents persist for many years , and can take a long time to be degraded or removed ; the good news is that , unlike some other forms of pollution , spillages of volatile organochlorines are apparently becoming rarer as awareness of the consequences of poor practice increases .
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