例句與造句

1. There have been several attempts to create a unified standard for instant messaging : IETF's Session Initiation Protocol ( SIP ) and SIP for Instant Messaging and Presence Leveraging Extensions ( SIMPLE ), Application Exchange ( APEX ), Instant Messaging and Presence Protocol ( IMPP ), the open XML-based Extensible Messaging and Presence Protocol ( XMPP ), and Open Mobile Alliance's Instant Messaging and Presence Service developed specifically for mobile devices.
2. It's difficult to find sip for instant messaging and presence leverage in a sentence. 用sip for instant messaging and presence leverage造句挺難的