最初塑料是从煤和木材中提取的。

Plastics was at first based on coal and wood.

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它们是由煤、玻璃、石油、牛奶和木材制成的。

These are made from coal, glass, petroleum, milk and wood.

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它们是由煤、玻璃、石油、牛奶和木材制成的。

These are made from coal, glass, petroleum, milk and wood.

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