事实上，LaunchRock 自身就是使用这个技巧，如果你希望使用LaunchRock的服务来创建Teaser页的话，你需要推荐至少3个人注册后才能够获得网站服务的访问权限。

In fact, LaunchRock itself uses this technique: in order to create your own teaser website through LaunchRock, you need to get three other people to sign up to the service… Confused yet?

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