several years produce one
Causes the product type to be unitary, several years produce one, day by day form the backward vicious circle.
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several years produce one
几年产生一个
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Due to its former importance as the centre of the cloth industry, the Cotswolds have a market tradition that goes back several hundred years, though for some villages, the switch to produce has been a fairly recent one.
BBC: Eat your way around the Cotswolds