比特币没有货币供应的中央权威支持或中央结算所。
Bitcoin does not have a central authority in charge of the money supply or a central clearing house.
杜菲说，他赞成设立中央结算所的想法，只是担心在操作上会出现问题。
'I'm in favor of this,' he said. 'I'm just very worried that it's going wrong.'
税收也有一些豁免，包括主要股票和债券的发行、即期外汇交易以及涉及中央结算所的交易。
There are several exemptions, including primary equity and bond issues, spot foreign-exchange deals and deals involving central clearing-houses.
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