He now sells his fuel at service stations, but refuses to sell his patent, despite attractive offers from overseas oil firms.
目前,他在服务站销售自己发明的燃料,但却顶住了外国石油公司的诱惑,拒绝出售生产生物柴油的专利。
2
To achieve the right mixture of propellant, the patent presents a hybrid rocket motor that would use 3-d stereolithography to essentially print the fuel.