The optimizer can decide to not use an index even if it could be used.

优化器可以决定不使用索引，即使该索引是可以使用的。

youdao

If you decide not to buy, the money you have spent on the survey is not recoverable.

如果你决定不买，你花在鉴定上的钱就拿不回来了。

《柯林斯英汉双解大词典》

Should you decide not to receive our information via email any longer, just click the link below to be removed from our list.

如果您决定不再通过电子邮件接收我们的信息，请单击下面的链接从我们的列表中删除。

youdao

He said he would support reforms to let ability -- not politics -- decide who would get government jobs.

VOA: special.2010.05.06

It's like when you have too much meat in the city, you decide to not eat any of it, so.

就像是在城市吃了太多的肉类，于是你决定再也不吃了。

与朋友们的回忆 - SpeakingMax英语口语达人

We should be able to try all things, to prove all things, and then decide whether or not we actually like it, whether it brings us some sort of pleasure or wisdom.

我们应该尝试所有东西，证实所有事情，然后决定我们是否真正喜欢它，它是否能带给我们快乐和智慧。

耶鲁公开课 - 弥尔顿课程节选

If we knew, we could decide to not come when the pool was crowded or come anyway.

CNN: Swim club accused of racial discrimination against kids

And, mostly, I leave it to you to decide where to not bestow your value.

FORBES: Casey Anthony, Justin Bieber, And Creating Value

The uproar led Augusta National to decide not to have advertising for the CBS broadcast of the Masters in 2003 and 2004.

CNN: Augusta National Golf Club admits first female members