当选项设置为开时，其它两个选项将设置为0。
When the option is on, the other two options will be set to 0.
GMail用户很快就会在设置选项中发现一个新工具，使他们从Yahoo Hotmail或者其它邮件服务商转换到GMail更加容易，而不依靠IMAP或者POP导入邮件。
Gmail users will soon notice a new tool in their Settings that makes switching from Yahoo, Hotmail, and many other email services a good bit easier than tinkering with IMAP and POP importing.
保留其它选项的默认设置，并点击Finish。
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