于是便可求得一条刚韧的绳索。
它采用轻韧的聚碳酸酯材料制作机身，速度快且敏捷。
The light and tough Polycarbonate body gives it exceptional speed and quickness.
分别给出了静止裂纹和定常扩展裂纹相变增韧的理论表达式。
The theoretical expressions of the toughening effect for both the stationary and steady - state growing crack are given respectively.
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