短語詞組短語skew probability curve 偏差機率曲線skew probability curve WESTBANK 偏差機率曲線skew frequency curve 偏態(tài)頻率曲線skew curve WESTBANK 不對稱曲線curve skew 曲線斜交Curve skew probability 偏差機率曲線 返回 skew curve