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WhatsApp有一套简单的标记方式，可帮助用户判断信息是否被成功发送、接收和读取。为了检查WhatApp信息的读取状态，你需要打开其中的一个对话。
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- 只有群里所有成员都看过群发信息后，两个勾才会变成蓝色。
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- 如果WhatsApp的用户启用了推送通知功能，他们不用打开WhatsApp也能看到你的信息。也就是说，只有当他们再次登录WhatsApp时，你才会看到两个勾变成蓝色。
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