前提条件：此用例仅说明给定应用程序的支付部分。
Preconditions: This use case is shown only for the payment portion of the given application.
而商业网站则可以从完成的交易额中抽取一定百分比支付部分花费。
Commercial sites could take a small percentage of any transaction carried out over them.
MLPs主要集中在石油和天然气领域，交易方法类似股票，根据法律分散支付部分或者全部现金流。
MLPs, which are mainly in the oil and gas sector, trade like stocks and by law pay out most or all of their cash flow in distributions.
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