Dropping the index is deferred until no user is using the index.

索引的删除延迟到没有用户使用该索引的时候。

youdao

Lions still occasionally prowl nearby, but their Numbers are dropping. There are no elephants any more.

我们偶尔还可以看到一些在附近闲逛的狮子群，但它们的数量却减少了，而象群是再也看不到了。

youdao

Someone keeps dropping off and coming back on but no one knows who.

有人半途掉线，又半途进来，但是谁也不知道是谁。

youdao

"That's no excuse for talking back to your teacher, or cutting class or dropping out of school.

VOA: special.2009.09.10

There's no dropping of lowest scores from the average.

并没有去掉最低分的情况。

麻省理工公开课 - 固态化学导论课程节选

That's no excuse for talking back to your teacher or cutting class or dropping out of school.

VOA: standard.2009.09.08

That may help: no more dropping sports in order to squeeze in extra drill on exam technique.

ECONOMIST: School examinations

This contrasts with almost no students dropping out of courses at St George's Medical School, Cambridge, and the London School of Economics.

BBC: State school pupils Oxbridge majority

The former IBF Cruiserweight Champion said he has no interest in dropping back down to that weight class.

WSJ: Tyson Fury stops Steve Cunningham to win US debut