Put the pack on a smooth surface, at waist height.
把包装放在一个光滑的表面,在腰部高度。
The stone has a smooth surface.
这块石头表面光滑。
The rough texture absorbs more light, and a smooth surface reflects light.
粗糙的表面会吸收较多的光线,而光滑表面会反光。
A smooth surface or track for sliding, usually inclined.
用于滑行的平面或路径,通常是倾斜的。
A smooth surface or track for sliding, usually inclined.
滑面,滑道:用于滑行的平面或路径,通常是倾斜的。
A smooth surface or track for sliding, usually inclined.
滑面,滑道:用于滑行的平面或路径,通常是倾斜的。
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