When the crystal size is about three nanometers (billionths of a meter), the material has its ultra-strong and ductile characteristics.
当晶体大小大约为3纳米（1纳米等于10亿分之一米）时，天然丝材料具有超强的强度与延展性特征。
The surface morphologies exhibit deformation wear in the middle and micro cutting wear in the sides, which indicate that all the samples exhibit ductile material characteristics in the erosion.
合金丝试样中部为变形磨损，侧面为微切削磨损，表现为典型的韧性材料冲蚀磨损特性。
The backlight photography with single sample was used to measure the true stress-strain of the ductile material after necking in tensile test.
本文采用单试样逆光拍照法对延性材料拉伸试验缩颈后的真实应力-应变进行了有效的测量。
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