Unit 20 New Frontiers
见过这样的汽车吗？不“喝”汽油，专“吃”咖啡渣。跟着下面的文章，一起体验一下这种新型环保汽车吧！
If you've ever wondered what people could do with those annoying used coffee grounds，engineers in the UK have come up with an answer：use them as gas for your car!
Engineer Martin Bacon and a group of volunteers from Teesdale Conservation in Durham，England，have been hard at work making those coffee grounds into something special：gas for a speedy coffeepowered car.
