Note that the service specification may only provide public operations, and each operation should only consume at most one message and produce at most one message.
注意服务的规约说明只能提供公开的操作，而且每个操作应当只能消耗至多一条消息、产生至多一条消息。
2
PSTN (Public Switch Telephone Net) short message, which is recently introduced by China Telecom, is a non-voice value-added service.
固话短信是中国电信新近推出的一项基于固定电话网的非话音类增值业务。
3
Concerning the insecure factors of Short MessageService (SMS) in public mobile network, a SMS system for secure communication was put forward.