Quality in many products depends on their degree of flexibility or stiffness. Packaging, playing cards, boxboard fabrics, containers, wire, tubing, many plastic and metal parts are examples.

许多产品的质量取决于其柔韧度或硬度，如，包装、纸牌、硬纸板织物、金属丝、管、塑料和金属部件。

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Quality in many products depends on their degree of flexibility or stiffness. Packaging, playing cards, boxboard fabrics, containers, wire, tubing, many plastic and metal parts are examples.

许多产品的质量取决于其柔韧度或硬度，如，包装、纸牌、硬纸板织物、金属丝、管、塑料和金属部件。

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