名词
中文翻译：上层
同义词：
['top layer', 'upper layer', 'superior layer']
例句：
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1. The company has a top-tier marketing team.
这家公司有一个顶级的营销团队。
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2. The building has a very high floor count.
这栋楼楼层非常多。
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3. The engineers worked on the top layer of the roof.
工程师们在屋顶的最上层工作。