技术上讲，丝纤维的强韧度堪比钢铁。
劲度、强度和韧度的完美平衡。
还给出了两个完全图乘积的坚韧度。
Moreover, we determine the toughness of the product of two complete graphs.
颈椎是具有强度和柔韧度的力学结构。
Cervical spine is a mechanical structure that has both strength and flexibility.
第二部分：断裂韧度的尺寸效应研究。
质量好的铸铁井盖是要看其韧度和硬度的。
Cast iron manhole cover of good quality is to see its toughness and hardness.
处理后的强度、硬度较高，但冲击韧度较低。
The strength and hardness is higher, but the toughness is lower after heat treatment.
热处理后，材料的硬度和强度均有提高，但冲击韧度下降。
Through heat treatment, material hardness and strength increase, but impact toughness decreases.
腰部必须具有相当的柔韧度和力量，它是舞蹈动律的核心部位。
Waist must have considerable Flexibility and strength, which is the heart of dance grooves.
而夹杂物尺寸和形态的不同，对钢的强度和冲击韧度影响也不同。
While, the inclusions had a certain effects on strength and impact with size and shape.
而夹杂物尺寸和形态的不同，对钢的强度和冲击韧度影响也不同。
While, the inclusions had a certain effects on strength and impact with size and shape.
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