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。

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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。

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The USDA also reports that 28 percent of adult participants in SNAP were employed.

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