edge retention meaning in English

边角防护

Materials and articles in contact with foodstuffs - cutlery and holloware - specification for sharpness and edge retention test of cutlery
与食品接触的材料和制品.刀具和凹形餐具.刀具的锋利性和刃口保持的试验规范
Materials and articles in contact with foodstuffs - cutlery and table holloware - part 5 : specification for sharpness and edge retention test of cutlery
与食物接触的材料和器具.餐桌用刀叉和中间凹形器皿.第5部分:刀叉的锋利性和刀口锋利保持试验规范
Materials and articles in contact with foodstuffs - cutlery and table holloware - part 5 : specification for sharpness and edge retention test of cutlery iso 8442 - 5 : 2004 ; german version en iso 8442 - 5 : 2004
与食品接触的材料和制品.刀具和凹形餐具.第5部分:刀