欧佩克或许无法正常展现其共谋能力，但其他大宗商品市场也相继出现了非正式、但却有效的卡特尔联盟。

Opec may not be able to realise its formal ability to collude. But other commodity markets also suffer from effective, if informal, cartelisation.

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不要关注于展现备选商品的相似点，而要传达出它们之间的不用。

Instead of focusing on displaying similar features of available plans, communicate the differences between them.

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当大庭广众下的购物者更倾向于购买绿色商品以展现无私精神时，关上家门在网上购物就是另一回事了。

While shoppers are more likely to buy environmentally friendly products on the high street where they can be seen to make the selfless choice, but behind closed doors it is a different matter.

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