最近，科学家开始怀疑白藜芦醇有特殊的功效，并着手研究它在生命周期中的作用。

More recently, scientists began to suspect resveratrol had particularly powerful effects and began investigating its role in lifespan.

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十三对玛雅人来说是个重要而神圣的数字，而第十三白克顿周期将在2012年12月21日左右终止。

Thirteen was a significant, sacred number for the Mayas, and the 13th Baktun ends around Dec 21, 2012.

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实验结果表明：正常肺音音源为白噪声，异常肺音音源为周期脉冲序列，肺胸系统相当于声低通滤波器。

The results of experiment show that dreath sound sources are random white noise, Abnormal breath sounds sources are sequence of periodic impulses.

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