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当牛顿走路看到一个苹果下落时，他突然有了一个想法。

Today, many people like travels, no matter which scenic spot people goes, such as the temple, historical site, old house and garden, the couplets are always be there. The couplet is ubiquitous in China, they are booligato decoration in holodays. When the Spring comes, every family will decorate home by couplet. Writing lucky words by beautiful calligraphy on two red papers, which will bring the good omen, and then stick on the door to increase the jubilant festive atmosphere.