1)seat seam / back rise,后裆缝/后浪2)back crotch seam,后裆缝3)back rise,后直裆，[粤]后浪4)seam gradient of back trouser crotch,后裆缝斜度5)seat-seam,后浪缝骨6)back rise,后直裆长，[粤]后浪长
用法例句
By means of mathematical analysis, the paper discusses how to determine the seam gradient of back trouser crotch according to types of figure.
