Hardness than corundum, abrasive easily broken, sharp edges and corners, good cutting, grinding heat and small.硬度高于棕刚玉, 磨粒易破碎, 棱角锋利, 切削性能好, 磨削热量小等.Salter held the bag by the corners and shook it upside down.索尔特捏住包的外角，把它倒...
那座塔陡峭地自平地耸起.The tower rises steeply from the flat ground.道路陡峭地攀爬至城堡.The street rose steeply up to the castle.这座小山向下陡峭地倾斜直到城镇上.The hill slopes steeply down to the town....