He struggled to hold the bike down on the banked corners.拐过斜弯时他竭力将自行车把稳。Young people came from the four corners of the nation.全国各地的年轻人都来到这里。Salter held the bag by the corners and shook it upside down.索尔特捏住包的外角，把它倒过来晃了晃。...
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...