名词
中文翻译：顶部沙子
同义词：
['topping', 'sanding']
例句：
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1.The top sand was removed to level the surface.
为了平整表面，移除了顶层沙子。
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2.The carpenter used a sanding block to smooth the wood.
木匠使用砂块来打磨木材。
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3.The builders were working on the top sand of the building.
建筑工人正在建筑的顶层工作。