contour-length method等高线: contour; isoheight; isoline; ...延长: lengthen; extend; prolong; p ...法: law等高线: contour (line); isoheight; isoline; isohypse (line) (地形图上标高相等的点连成的封闭曲线)管线延长: gxyc下载手机词典可随时随地查词查翻译
