There are some books on the bookshelf.(书架子上放着一些书。)
The bookshelf is fastened to the wall.(这个书架被固定在墙壁上。)
I have many books on my bookshelf.(我的书架里有很多书。)
Roughly the size of a soda can, sitting on a bookshelf, a relatively harmless gadget may be turning friends away from your home.(一个汽水罐大小的小东西放在书架上，这个相对无害的小玩意可能会让你的朋友厌恶你的住宅。)
The book on the top of the bookshelf needs a dustcover.(书架顶上的那本书需要一个防尘外壳。)
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