求翻译：从曲线关系可以看出，随着硬度增加，平面应变断裂韧性（KIC）值显著下降。这就是说在确定弹簧的硬度硬度值时，应本着在满足弹簧特性要求的前提下，弹簧的硬度值偏低一些好。是什么意思？

Can be seen from the curve of the relationship with the hardness increases, the plane strain fracture toughness (kic) values ​​decreased significantly. This means that to determine the hardness of the spring hardness value should be based on the premise that meet the requirements of spring character

From curve relationship can be seen that, with increased stiffness, plane strain fracture toughness (KIC) values declined significantly. This means that the spring determine the hardness value is hard to be in the spring feature requirements met, the spring stiffness in the low value.

May see from the curve relations, increases along with degree of hardness, plane strain break tough (KIC) value remarkable drop.This meant in determined when spring degree of hardness degree of hardness value, should in line

Can be seen from the curve, with increased hardness, plane-strain fracture toughness (KIC), value declined significantly. This means that when determining hardness hardness value of spring, spirit spring property subject to the requirements of are met, spring low hardness value of some good.