Example sentences of "[vb -s] [adv] [prep] a period " in BNC.

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1 Tests on women with dermatitis found that the condition worsens just before a period , and those sensitive to base metals are most likely to develop a reaction at that time too .
2 The efficiency of these ingredients wears off over a period of time , and swimming , towel- drying and perspiration can speed up this process .
3 The Office hints defensively at a period of nomadic existence which was censured by critics as unstable .
4 The behaviour persists continuously over a period of time .
5 The work made in response to this moment often gains immensely from a period of marination in further reading and research .
6 The Lu-Fan operates quietly over a period of four minutes , switching off automatically , but it can be restarted immediately if required .
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