无状态型(默认选项)：你的服务器保持无状态，不保存任何额外信息。
Stateless (the default) : your server remains stateless and do not store any extra information.
为了显示这些广告，我们的系统不需要存储任何额外信息。Gmail只会从用户另一封最近邮件来进行匹配。
To show these ads, our systems don't need to store any extra information - Gmail just picks a different recent email to match.
为了显示这些广告，我们的系统不需要存储任何额外信息。 Gmail只会从用户另一封最近邮件来进行匹配。
To show these ads, our systems don’t need to store any extra information —Gmail just picks a different recent email to match.
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