jiāo biàn
意思解释：（Hand in change）波形从零到极大值，再回到零值(或正或负)的变化，等于半个周期。
袁侯出宰古交河，铜章墨绶杂雕戈。黄云高阙芳菲少，紫塞长城氛祲多。桑榆荫入嫖姚幕，弦诵音谐敕勒歌。公主琵琶玉连琐，将军騕袅金盘陀。袁侯雕龙…
Yuan Hou goes out slaughter ancient cross a river, dagger of miscellaneous carve of Shou of cupreous chapter Chinese ink. Humble of yellow cloud tall Que Fang is little, Dai of atmosphere of Great Wall of violet a place of strategic importance is much. Sang Yuyin enters act of go whoring Yao, imperial order of humorous of bowstring Song sound straps a song. Princess lute jade connects trivial,
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