对他们来说，这是一种记录支出的非常有效的方法。
It was a very effective way for them to keep track of their spending.
在赫斯特的作品被出售后的几周和几个月里，任何形式的支出都变得非常不流行。
In the weeks and months that followed Mr Hirst's sale, spending of any sort became deeply unfashionable.
与此同时，另一些组织在碳交易中以非常微小的支出赚取了巨大的利润。在某些情况下，它们拿出来交换的，是它们无论如何都要进行的清理工作。
Others are meanwhile making big profits from carbon trading for very small expenditure and in some cases for clean-ups that they would have made anyway.
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