名词
中文翻译：层
同义词：
['stratum', 'stratum', 'layering']
例句：
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1. The cake has a layerof chocolate on top.
蛋糕顶层有一层巧克力。
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2. The book is divided into several layersof information.
这本书被分成了几个信息层次。
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3.The city was built on multiple layers ofhistory and culture.
这个城市建立在多重历史和文化层次上。