ARM RISC完成呼叫处理、通信协议的转换、网络的管理以及用户界面的支持，这些则属于一般性的处理功能。
ARM RISC performs call process, protocol process, net management and user interface, these are normal process function.
2
一般来说，商业信件的作用可以说是询问或传递或者接受或者提供处理有关商业协议的问题的信息。
Broadly speaking, the functions of a business letter may be said to be to ask for or to convey information, to make or to accept an offer to deal with matters concerning negotiation of business.
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