Mobile technology products such as smartphones can be seen as a luxury product (Brassington and Pettitt 2006, p. 57).

移动技术的产品，如智能手机，可以被看作是一个奢侈品(布拉·斯顿和佩蒂特2006，第57页)。

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Dr Paul Pettitt, a senior lecturer in Palaeolithic Archaeology at Sheffield University, has written a narrative to accompany the stamp series.

BBC: Jersey Post mammoth stamps mark archaeological history

Sarah Pettitt, who chairs the National Farmers' Union's horticulture and potato board, said growers were struggling to harvest vegetables such as cabbages, cauliflowers and leeks.

BBC: Schools open for exams as freeze eases in parts of UK

Sarah Pettitt, chairman of the Horticulture and Potato Board of the National Farmers' Union, said farmers were having to use "innovative and desperate measures" to harvest crops in frozen ground.

BBC: How are farmers coping with the snow?