OK，点击"撰写邮件"（Compose Mail），如果你看到"Set custom time"选项，那就恭喜你了！你可以使用它了：
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compose e-mail 写电子邮件
compose e mail 写邮件
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This month, Google redesigned Gmail a bit, installing a more prominent "Compose Mail" button, among other changes.
CNN: Gmail looks to clear clutter with Priority Inbox
It will be a while before a jogger will be able to strap on an armband and compose e-mail while running.
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