A nucleus that large cannot be stable, but it might be possible to assemble one next to a vacuum for long enough to observe the decay of the vacuum.

这么大的原子核不可能是稳定的，但在足够长的时间内，在真空附近组装一个原子核以观察真空的衰变是可能的。

youdao

Similar machines have flown in space aboard NASA's shuttles, but they couldn't be tested for long enough to prove whether they were effective.

类似的机器也曾搭乘美国宇航局的航天飞机在太空中飞行，但无法进行时间足够长的测试来证明它们是否有效。

youdao

Watch it for long enough, and you can sometimes predict its next move.

看了一段时间之后，你有时候就能够预测到它的下一个动作。

youdao

"There may be enough to eat for a while." he says, "but before too long there may be hunger."

VOA: special.2010.04.13

And, in fact, you should stop noticing it after it's been in the environment for long enough.

事实上，如果它在环境中出现的时间足够长久的话,你就不该再去一直注意它了。

耶鲁公开课 - 心理学导论课程节选

And Joom from Thailand wrote: I don't care where the crops come from, natural plants or genetic engineering, as long as we can produce food enough for people.

VOA: special.2010.05.18

He'd like kids but fears he's getting too old to be around for long enough.

FORBES: Magazine Article

You have considered a message for long enough to make a judgement about it.

FORBES: Mailbox App Revolutionizes Gmail Productivity, Will Google (Or Apple) Buy It?

Put on an act for long enough and it's hard to remember what's real.

NPR: Excerpt: 'Inventing Niagara'