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Four wheel shopping trolley (四轮购物车)
Add a couple of small foldable wheels based of classical styles.
When small wheels open,it's easier to pull on the slope.When them closed,it also can save space.
在经典款式上加上一队可收放的小轮子。
当放开时，变为四轮车型，方便在坡形地面上的推行，更增加了推车的稳定性。小轮子收起，又可节省空间。
