Example sentences of "twenty years the [noun] [prep] " in BNC.

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1 Pollen 's instruments in their final forms were in themselves significant scientific and technical achievements — the incorporation of a differential analyser in his gunnery computer ( known as the Argo clock ) , for example , anticipated by nearly twenty years the work in this important area of both D. R. Hartree [ q.v. ] and Vannevar Bush .
2 In the past twenty years the population of this town has almost doubled and the number of cars using the roads has trebled , making that quote much much more topical .
3 During the past twenty years the role of export education has been fulfilled by the Institute of Export without any assistance or recognition whatsoever .
4 For the next twenty years the number of unemployed never fell below a million .
5 In the last twenty years the importance of migration has been reinforced by the decline in rates of natural increase ; now that births and deaths are almost in balance , migration is the crucial determinant of whether population grows or contracts even at the national level .
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