steepenv.使 ... 陡峭； 变得更险峻steepadj.险峻的；陡峭的；急剧的、大起大落的v.浸泡，浸透，湿透；沉浸，笼罩steeply dipping coal seam大倾角煤层steep inclined thick seam急倾斜厚煤层steep medium- thick seam急倾斜中厚煤层steeply foreshortened view过于缩小的视野steeply inclined coal seam急倾斜煤层Steeply pitching thin vein急倾斜薄矿脉steep slope of dam section陡坡坝段steep-inclined coal seam急倾斜煤层steepest descent algorithm最速下降算法steepest descent direction最陡下降方向