Building the Seat Frame 大楼的座架 Practice First! 实践第一！
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building the seat frame
搭建座椅框架
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He starts by building and painting the all-important frame, whose geometry determines that the seat, handlebars and pedals are in the correct position for each cyclist and the sort of riding they do.
BBC: How to build a bike: The revival of a British craft
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