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.
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.
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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