求翻译：其次是传统制备生物柴油的体系伴随了10%的副产物甘油产生，随着生物柴油的需求不断上升导致附加值低的甘油的产量过剩，生产成本难以降低。是什么意思？

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This was followed by the preparation of bio-diesel fuel in the traditional system has been accompanied by 10 per cent by-product of the glycerine, along with the needs of bio-diesel fuel the constant rise in low added value, the glycerine excess production, production costs lower.

Next was the traditional preparation biology diesel oil system has followed 10% by-product glycerine production, rose unceasingly along with the biological diesel oil demand causes the added value low glycerine the output to be surplus, the production cost reduced with difficulty.

Followed by traditional biodiesel production system with the 10% of by-product Glycerin, along with rising demand for bio-diesel causes low value-added Glycerin GLUT, high production costs decrease.

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