Most Americans advocate the spirit of social service and voluntary contribution.

大多数美国人提倡社会服务和志愿贡献的精神。

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As they are increasingly time impoverished, they place a higher value on their time and as a result they see the contribution you make to be of greater value than what you charge for that service.

由于人们的时间越来越不够用，他们变得越来越珍惜时间，因此更加重视代理商提供的帮助，而不是他们的服务收费。

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Once you know the selling price and direct costs of each product or service unit you sell, you can calculate your contribution margin in dollars per unit.

一旦你知道了产品或服务的零售价和直接成本，你就可以计算出单位产品边际收益。

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"In welcoming the appointment we are concerned at the cost of the appointment, given the austerity measures facing the public service, and the limited contribution an appointment of a few days per month would make, " said the spokesman.

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"We are in regular touch with local authorities about what might be available and are grateful for the contribution they make to the Prison Service, " she said.

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And we have an interest in making sure that companies that benefit from an educated workforce, a free health service, a solid and reliable legal system and an efficient transport network, make their proper contribution to an infrastructure whose absence would be devastating to them.

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