标签:thresher 相关文章
Theres a tiny car that turns in a perfect circle, and stands up on two wheels for parking. Solar roofing tiles to collect energy for home needs. A grain thresher thats made of bicycle parts. These are some of the creations at the Smithsonian Cooper-H
发表于:2019-02-12 / 阅读(81) / 评论(0)
VOA标准英语2010年(六)月