这些规范可以使程序之间通过一个熟悉的通道进行通信，这与您选择电话或传真号的道理是一样的。
These conventions are used to allow programs to communicate with each other over a known channel in the same way as you would choose a phone or fax number.
对不起，您能告诉我您办公室的传真号吗？
Excuse me, can you tell me the fax number of your office, please.
请告之您所需要的黑碳化硅的具体粒度号及指标要求，传真或回复邮件。
Please inform me the specific mesh size and specification of black silicon carbide you required, you can contact me through fax or email.
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