Sometimes it will 're-build' this index to make sure that it is up to date and knows which packages have been upgraded or added into the channel since it last checked.
有时候它将会重建这个索引来确保它是最新的，同时可以了解从最近一次检查以来哪些包已经被升级或者加进了频道。
Candace: This was sent 4 hours ago, but held up by somebody, as it didn't arrive in the mail until much later, it was not there 2 hours ago when I last checked.
此信息发送于4个小时之前，但被什么人拖延了，直到很久之后才送达，2小时前我查看邮箱时还没有收到。
Candace: This was sent 4 hours ago, but held up by somebody, as it didn't arrive in the mail until much later, it was not there 2 hours ago when I last checked.
此信息发送于4个小时之前，但被什么人拖延了，直到很久之后才送达，2小时前我查看邮箱时还没有收到。
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