multiple equipotential rings 提出一种多等位环
The Activity Stacker is a pyramid made of multiple rings that fit onto a soft cylinder.
活动套叠组玩具是一组多环组成的金字塔，这个金字塔可套在一个软质的圆柱体上。
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Multiple sealing rings, fitted throughout the lens body, prevent water splashes and dust from penetrating, making the M.
ENGADGET: Olympus unveils a cavalcade of point and shoot cameras and a PEN lens at CES
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