这种“绿色瓶”是由柳枝稷，松树树皮，玉米糠为原料制成的。

Its “green bottle” is composed of switch grass, pine bark and corn husk.

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消费者比从前更喜欢天然原料而非由石油制成的尼龙、人造纤维等材料。

Consumers are keener than ever to use natural products instead of materials like nylon and rayon which are made from petroleum.

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PET由两种原料制成，一种是有机酸，另一种是相对便宜的乙二醇。

PET is made from two feedstocks, one of them an organic acid, the other ethylene glycol, which is relatively inexpensive.

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