This is called a rarefaction and is represented by widely spaced dots.这个区域称为稀疏区,并用疏散的小点表示.The classical elementary waves in Riemann solutions include rarefaction wave, shock wave and contact discontinuity.黎曼解涉及的经典基本波包括疏散...

rarefaction的音标：rarefaction的英式发音音标为：[ˌreərɪ'fækʃn]rarefaction的美式发音音标为：[ˌrɛrə'fækʃən]...

n.变稀薄，稀薄...