名词
中文翻译：层
同义词：
['stratum', 'stratum', 'superficial layer']
例句：
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1. The building is constructed with multiple layers of bricks.
这栋建筑是用多层砖砌成的。
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2. The soil is a natural layer of rocks and minerals.
土壤是一层岩石和矿物质的自然层。
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3. The city has been divided into several layers of government.
这个城市被分成了几个政府层级。