什么是合并帐单和发票？
合并帐单和合并发票是同一件事。合并帐单是关键过程，发票是结果。
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货币化
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什么是免费试用，以及何时使用？
A free trial is a customer acquisition model common in SaaS and subscription models. It allows testing of a product before purchase.
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什么是月度经常性收入（MRR）？
Monthly Recurring Revenue or MRR is a calculation of monthly income based on received recurring payments and a basis for business forecasting.
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