延续的趋势表明只有极少数国家将会被永远局限在单一资源上。
That continuing trend will mean that very few countries will ever be locked into a single source.
举个例子，克鲁格曼在一个月前以单一的基点画了一张他著名的“趋势线”，一个名叫“rjh”的网民立即做出了回应，“你画的这些乱七八糟的趋势线。”
For example, when Krugman a month ago drew one of his famous "trend lines" based on a single point, a blogger named RJH immediately responded, "These trend lines you are drawing all over the place."
但是这一趋势可能并不是由单一原因引起的，所以研究者们怀疑光线干扰也是其中原因之一。
And while there is probably no single reason for the trend, researchers suspect that light disturbances may play a part.
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