吸气并且还原至起始姿势并且继续拉伸至左侧，末端呼气。
Inhale and return to start position and continue stretch to left, exhaling at end.
当拉伸应变达到承载极限，继续拉伸，力突然变的很小，这是因为团簇发生了结构变化。
When the tensile strain reaches the limit load, the force of tension suddenly becomes very small, because clusters structures change.
纺纱过程要求一束短纤维排成一线，将他们拉入一对罗拉中，例如粗纱，继续拉伸并加捻粗纱形成纱线。
The process requires aligning a bundle of staple fibers, pulling them out into a rope, known as a roving, and further pulling out and twisting the roving to form the yarn.
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