当创建一个项目记录时，可用的类别出现在下拉列表中。
When creating a project record, the available categories appear on a drop-down list.
注册中心可以保存有关曾经处于活动状态但不再可用的服务的记录。
Registries may want to keep a record of services that were once active, but are no longer available.
该网站也可用来记录和发送简短的视频消息。
The site can also be used to record and send short video messages.
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