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。

youdao

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。

youdao

Last time we checked the type and said if it is a float you're okay. If not, carry on.

并且会告之是否是一个浮点数,如果不是继续循环。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's just the those-- let me use my pointer that's just these two lines here. I checked the value, and in one case, I'm changing the last to be mid minus 1, which is the case I'm in here and I just call again. All right?

来看看ppt，这里有两条线,我检查了值，在一种情况下,我把last指向了中点减一,就是这种情况,我们再来调用一下怎么样？

麻省理工公开课 - 计算机科学及编程导论课程节选

When we last checked in with Sandvine's stat trackers, Netflix reigned supreme in online video traffic at home, especially downstream.

ENGADGET: Netflix keeps its lead in streaming video use at home, YouTube rules the road

Summers last checked in with his probation officer at some point earlier this month and had been complying with his release terms, police said.

NPR: LA Police ID Suspect In Girl's Abduction Case

When we last checked in on Shutterstock founder and CEO Jon Oringer in October 2012, his company had only been publicly traded for a week.

FORBES: Move up http://i.forbesimg.com t Move down