Standard rubber bands, which can stretch up to several hundred percent then snap back into shape, are made from long chains of cross-linked polymers.
标准橡皮筋由交错连接的长链聚合物制成，能拉伸至原先长度的几倍，释放后可缩回原型。
Lean against the back and stretch your legs out. Cross your ankles so that your left (if male) or right (if female) ankle overlaps your other ankle.
交叉脚踝，让你的左脚踝(男)或右脚踝(女)叠在另一只脚踝上。
Standard rubber bands, which can stretch up to several hundred percent then snap back into shape, are made from long chains of cross - linked polymers.
标准橡皮筋由交错连接的长链聚合物制成，能拉伸至原先长度的几倍，释放后可缩回原型。
The effect of stretch on the cross-section shape of polyacrylonitrile (PAIN) fiber was studied during the process of wet spinning and dry wet spinning.
研究了湿法和于湿法纺制异形聚丙烯腈(PAN)纤维过程中拉伸对纤维截面形状的影响。
The effect of stretch on the cross-section shape of polyacrylonitrile (PAIN) fiber was studied during the process of wet spinning and dry wet spinning.
研究了湿法和于湿法纺制异形聚丙烯腈(PAN)纤维过程中拉伸对纤维截面形状的影响。
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