The Copenhagen meeting drew about , 2,000 scientists from around the world, and the news they delivered was not encouraging as they warned of an increasingly warmer world with more frequent droughts, and food and health problems.

VOA: standard.2009.03.12

Now, the reason to be interested in them, again, is not because they're frequent.

对这些障碍非常关注的原因,并不是它们很常见

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