New innovations increased efficiency and production doubled every two years. Rubber could be produced at only a fraction of the cost of collecting wild rubber in Brazil.
新的革新技术提高了效益，橡胶产量每2年翻一番，在那里生产橡胶的成本只是巴西采集野生橡胶的成本的很小一部分。
New innovations increased efficiency and production doubled every two years. Rubber could be produced at only a fraction of the cost of collecting wild rubber in Brazil.
新的革新技术提高了效益，橡胶产量每2年翻一番，在那里生产橡胶的成本只是巴西采集野生橡胶的成本的很小一部分。
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