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They're made of plasticized cellulose acetate which doesn't mean that they'll stay whole forever.

们是由塑化醋酸纤维素制成的,这并不意们会永远完整地存

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After numerous failed attempts to make use of PVC, an American successfully plasticized it in the 1920's and began experimenting with it as a cheaper and more durable alternative to rubber and to other plastics.

过无数次利用PVC的失败尝试,一位美20世纪20年代成功地将其塑化,并开始试验将更便宜耐用的PVC作为橡胶和其他塑料的替代品。

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