如果有自动应答器，可以建立确认列表，最好是双向确认列表。
If you have an Autoresponder to build an Opt-In list, use a double Opt-In.
两家银行都没有提供双向短信确认服务。
经全双工(双向同时)数据链路，不用专门(确认)报文返回确认信息所用的技术。
A technique used to return acknowledgement information across a full-duplex (two-way simultaneous) data link without the use of special (acknowledgement) message.
车-地之间双向传输，信息闭环确认；
Two way transmission between the train and ground facilitates closed-loop acknowledgement.
经全双工(双向同时)数据链路，不消专门(确认)报文返回确认信息所用的技巧。
A technique used to return acknowledgement information across a full-duplex (two-way simultaneous) data link without the use of special (acknowledgement) message.
经全双工(双向同时)数据链路，不消专门(确认)报文返回确认信息所用的技巧。
A technique used to return acknowledgement information across a full-duplex (two-way simultaneous) data link without the use of special (acknowledgement) message.
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