不过，想要让对方看到你发送的离线消息，他必须允许保存历史聊天记录（chat history）才行。
基于20个网页-相关网页
chat history » 聊天历史 and here we are » 和我们在这里 ..
基于1个网页-相关网页
Clear Chat History 删除之前的所有对话纪录
Clear r Chat History 删除之前的所有对话纪录
·2,447,543篇论文数据，部分数据来源于NoteExpress
Search in contact list and chat history.
搜索联系人名单和聊天记录。
youdao
Some great improvements have been made to the chat history function.
对聊天历史功能做了一些重大的改进。
It's a much bigger step than when Gmail introduced chat history but still aligned with the same concept.
和 Gmail 导入聊天记录比，这是一个大得多的进步，当然概念是相同的。
Currently when you leave a chatroom, all of the chat history is deleted.
FORBES: Chrome Extension Turns Any Website Into a Chatroom
Users want gravatars, chat history, domain-level chatrooms, and notifications, among other goodies.
It allows police in California to access any data stored on an arrestee's phone: photos, address book, Web-browsing history, data stored in apps (including social media apps), voicemail messages, search history, chat logs, and more.
CNN: STORY HIGHLIGHTS
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