"My goal is always to create products that make bicycling easier and more fun for the user," Lumpkin says.
“我的目标始终是创造新产品，使用户更方便，更有趣的自行车，”兰普金说。
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Now, Mr Lumpkin reckons, the best current technologies could perhaps increase yields by 50%-still a lot, but not as spectacular as the earlier improvements.