But according to a new study, attacks that seem sporadic in the beginning can begin to show a pattern as the aggressors refine their methods.

但是最新的研究表明，开始看起来分散的袭击会随着攻击者改变他们的方法而显示出一定的模式。

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While the new study identifies an intriguing pattern of gloom and glee across the country, the factors behind the pattern are less clear.

尽管一项新的研究表明，一种神秘的悲伤或者快乐的形式正遍布全美，但是其背后的原因我们却知之甚少。

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As a sort of new educational pattern, long-distance education has been familiarized and accepted gradually by society and has become an effective way to construe the concept of life-long study.

现代远程教育作为一种较新型的教育形式，已逐渐为社会大众所熟悉和接受，成为构建终生学习的有效途径之一。

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