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You don't have to pay extra for breakfast.

你不必付额外的早餐钱。

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Every time the farmers buy seeds, fertilizer or other inputs, they pay an extra five percent in addition to the price.

VOA: special.2010.05.11

but you sort of pay extra to be here, where all the people is, and

但是你像是支付了额外的费用来这里，所有人也都是如此，

卡姆登市场的魅力 - SpeakingMax英语口语达人

This means that you would have to pay extra money at the end, but they decided that people have trouble doing that.

这表示你在最后必须支付额外的款项,但他们觉得人们对偿还额外款项会有困难

耶鲁公开课 - 金融市场课程节选

Precious metals traders need to pay extra close attention to the U.S. grain futures markets today.

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Ms Jones-Napier says her customers are also happy to pay extra to support the company's values.

BBC: US firms put social values before big profits

And householders generally grumble a lot if they have to pay extra to have their rubbish collected.

ECONOMIST: Less is more