Membership invitations or passwords to the site can be purchased easily and cheaply — though in violation of the site's rules — on eBay or other online invitation sites, members say.
会员们表示，虽然违反网站的规定，但入会介绍信和密码很容易就可以在eBay或其他网站以低价获得。
Spotify (spotify.com), the site for listening to free, streamed music, has become so popular that membership is by invitation or via a long waiting list.
Spotify（sporify.com）是个聆听免费又流畅的音乐网站，它很受欢迎，要想成为会员，得有邀请，要不就得排着长队等待。
You can also start a public group with invitation-only access, allowing you to control membership by having users request to join.
也可以发起一个只有受邀请的用户才能加入的公共组，这样可以通过让用户请求加入来控制成员资格。
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