它的表面环绕了一层薄木板保持表面光滑，能够使它滚动起来，在侧面开口以及预订窗户能够让外部的光线照射进来。
Thin wooden slats circle the unit to provide a smooth running surface to roll it and openings on the side and slated Windows let light into the interior.
一些表面光滑的零食容易使人窒息，例如，果冻和汤圆，因此食用此类食品时要多加注意。
Some snacks with slippery texture will lead to choking easily, like jelly and glutinous dumpling, so take more care when eating this kind of food.
在制造陶器时，他们会使用陶轮，使陶器的表面光滑、细腻。
In the manufacture of pottery, they will use the pottery wheel to make pottery surface smooth, delicate.
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