One key issue is how to produce more food in a world of finite resources.

一个关键问题是如何在资源有限的情况下生产更多的粮食。

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The suggested theory is that a plant community becomes more susceptible to invasion whenever there is an increase in the amount of unused resources.

提出的理论是，当未利用资源数量增加时，植物群落更容易受到入侵。

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More information on regular expressions is available in several online resources, including many tutorials.

一些在线资源(包括许多教程)提供了更多关于正则表达式的信息。

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During tough times, when resources are tight, it is even more important to ensure those resources are focused in the right areas.

FORBES: Magazine Article

"You may be assured there will be sufficient resources in the event of more disorder for however long is necessary, " Chief Constable Matt Baggott said in a statement.

CNN: STORY HIGHLIGHTS

There was a time when it looked as though his financial strength alone would ensure a Bush victory - now he and Al Gore are much more evenly matched in terms of resources, and a frenetic round of new fund-raising is sure to begin in the next couple of months.

BBC: The establishment strikes back