Farmers often use their extra earnings to buy books for their children or to pay for schooling.

VOA: special.2009.08.17

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

... A 'green power' program regularly invites customers to pay $4 to $10 extra per month to switch to clean energy.

VOA: standard.2010.03.23