本文首先使用初等方法导出三角形与四边形的等周不等式，进而用富里埃级数方法解决了一般等周问题。
We deduced equal perimeter inequality of triangle and quadrangle by elementary mathematical methods first and solved general equal perimeter problems by using methods of Fourier series.
动物园通过为期一周的一系列流动和宝宝说再见，包含饺子宴，多个心形冰蛋糕以及和饲养员问答互动等。
The Zoo said farewell to Bao Bao with a series ofgoodbye eventsover the long weekend, including a dumpling party, multiple heart-shaped ice cake feedings, and interactive Q&As with keepers.
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