What's the standard rate of a letter?
一封信的标准收费是多少？
What's the standard rate to send a letter to Beijing by air?
寄一封平信到北京的标准空邮收费是多少？
A periodically adjusted rate, usually based on a standard market rate.
调整的利率，通常以某一市场基准利率为基础。
A periodically adjusted rate, usually based on a standard market rate.
调整的利率，通常以某一市场基准利率为基础。
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