在最初的成本投入之后，这种能源就是免费的。

After the initial capital costs this energy is free.

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而且，这类网站推广的工作需要大量的成本投入。

And, the job that this kind of website popularizes needs much cost investment.

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每个制造商的成本投入都有所增加，因此他们都想提高价格。

Higher input costs hit all manufacturers alike, so they all wanted higher prices.

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Once we have those classrooms, the stuffing cost is to be designed to be the same as what we currently use in personal physics.

一旦我们建成这些教室，其他的人员成本应该,和现在投入到物理教学,所用的成本一致。

麻省理工公开课 - 媒体、教育、市场课程节选

The major class is the upfront across the building is new classrooms and the institutors invested in.

最主要的成本是大楼的预付成本,新教室,以及机构的相关投入。

麻省理工公开课 - 媒体、教育、市场课程节选

And in general, when people devote a lot of energy or money or expense to something, they are extraordinarily resistant to having it proven wrong.

一般来说，当人们投入的精力，金钱或成本越多时，他们就越不会相信自己是错的。

耶鲁公开课 - 心理学导论课程节选