名词
中文翻译：层
同义词：
['stratum', 'stratum', 'layer', 'stratum', 'stratum']
例句：
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1. The cake is divided into three layers.
蛋糕被切成三层。
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2. The book has several layers of information.
这本书包含了许多层次的信息。
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3. The city is divided into several layers of government.
这个城市被分为几个政府层级。