Example sentences of "this [is] often an " in BNC.

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1 This is often an unintentional form of steering which happens when the sail is not at the correct angle to the wind — the section of the sail next to the mast does not fill with wind and the driving force acts from a couple of feet farther back .
2 Another option is migration , whether to the urban areas where work is thought to be available — though this is often an illusion — or to South Africa and Botswana .
3 There are many , often very large areas , that are publicly owned and of great value to wildlife but these sites are not primarily managed for wildlife , although this is often an important consideration and some suffer considerable disturbance .
4 A dichotomy between organic and non-organic failure to thrive has developed , but this is often an oversimplification of the clinical picture .
5 In common with the Pterophyllum species any fish that shows really intense colour and exaggerated black bars should be regarded with suspicion as this is often an indication that they are not long for this world .
6 This is often an essential first step in identifying the strengths and personal resources which an older person has developed during their lifetime .
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