求翻译：一般该种模式的网站都会提供一个平台，由知识的需求者和知识的提供者进行交易，交易成功后往往会有需求方支付一定的代价，这里的代价可以是虚拟货币、积分、或是现实中的货币。是什么意思？

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In general the model of the web site will provide a platform, which the demand for knowledge and knowledge of a successful transaction, the transaction will often have a need to pay a certain price, and the price here is either a virtual currency, points, or in the real world currency.

The general this kind of pattern website can provide a platform, and the knowledge tenderer carries on the transaction by the knowledge demand, after the transaction succeeds often can have demand side payment certain price, here price may be the ideal money, the integral, perhaps in the reality cur

General Web site will provide a platform for the pattern, provided by the demand for knowledge and knowledge of trading, after successful transactions tend to demand pay a certain price, here is a virtual currency, credits, or at the expense of real-world currency.

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