若您想要对从他处得来的内容向客户收取费用，那么您很可能需要先得到对方的书面许可。
It's likely you'll need written permission from the content source if you are going to charge clients for content you are redistributing from another source.
保险公司从事之业务就是代表客户承担危险，作为互换，公司向客户收取费用——保险费。
Insurance companies are in the business of assuming risk on behalf of their customers in exchange for a fee, called premium.
再加些点缀，假设每次这种客户端将供应商的伺服器用于认证时，供应商就开始向某人(可能是贸易商，也可能间接地是客户)收取费用。
To put the icing on the cake, say this vendor starts to charge someone (perhaps the merchant and, indirectly, the consumer) every time its servers are used for authentication by this client.
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