宝马这次风险投资的伙伴是西格里碳素集团。
在美国西北部，西格里碳素集团和宝马合资生产的这些碳纤维比人的头发还细十倍。
The joint venture of SGL and BMW produces these carbon fibers, 10 times thinner than a human hair, in the northwestern United States.
西格里碳素集团位于威斯巴登，曾属于郝斯特化学工业公司，现在是欧洲唯一的碳纤维材料生产商。
Based in Wiesbaden, SGL was once owned by the Hoechst chemicals company and is currently Europe's sole manufacturer of carbon fiber materials.
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