以下为句子列表：
英文: It is very strong, and can stretch to add one-third more to its length, then snap back to its original length without change in shape.
中文: 丝的质地非常坚韧，能被拉长并超出其原来长度的三分之一，接着又砰地一声回复到它原来的长度而不改变形状。
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英文: It took my dad a while to snap back from his hip operation.
中文: 我爸爸做了腰部手术后，花了一段时间恢复元气。
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