短語詞組短語periodic cosine wave solutions 余弦函數(shù)周期波解periodic spiral wave 周期螺旋波periodic slow wave system 周期慢波系統(tǒng)periodic travelling wave solution 周期行波解periodic solitary wave solutions 周期孤立波解periodic electromagnetic wave 周期電磁波periodic traveling wave solutions 周期行波解periodic water wave 周期水波periodic travelling wave solutions 周期行波解 返回 periodic wave