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

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

They looked for trees old enough to provide long-term records.

VOA: special.2010.05.25

Osman says long-term residents like her were already struggling to find enough food and water for thousands of recent arrivals from Mogadishu.

VOA: standard.2009.10.06

So does one long tunnel, just wide enough for one boat to get through.

VOA: standard.2010.04.29

Lieutenant General Ronald Burgess response this question from Levin, "With the installed centrifuges that they have, how long would it take,approximately, to produce enough highly-enriched uranium for one nuclear weapon?"

VOA: standard.2010.04.14