{a. An instance of disparity or unlikeness: There exists a significant difference in seem involving a clarinet and an oboe.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。Need to thank TFD for its existence? Convey to an acquaintance about us, add a hyperlink to this web page, or pay a visit to t