只有硬度而没有弹性和韧性的钢材称不上好钢；

Only the hardness and elasticity and toughness of the steel is not good steel;

youdao

只有硬度而没有弹性和韧性的钢材称不上好钢；

Only the hardness and elasticity and toughness of the steel is not good steel;

youdao