Do you know what is stronger than steel, lighter than a feather and as elastic as a rubber band? '?
你知道有什么是比钢铁还要强，比羽毛还要轻，和橡皮筋一样有有弹性吗？
Do you know what is stronger than steel, lighter than a feather and as elastic as a rubber band?
你知道有什么是比钢铁还要强，比羽毛还要轻，和橡皮筋一样有有弹性吗？
Do you know what is stronger than steel, lighter than a feather and as elastic as a rubber band?
你知道有什么是比钢铁还要强，比羽毛还要轻，和橡皮筋一样有有弹性吗？
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