名词
中文翻译：中层
同义词：
['mid-level', 'intermediate layer']
例句：
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1. The engineer designed a system with multiple layers of security.
工程师设计了一个具有多层安全系统的系统。
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2. In the middle layer of the forest, there are many rare species.
森林的中层有许多稀有物种。
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3. The company has implemented a new management structure that breaks down into three main layers.
该公司实施了一种新的管理结构，分为三个主要层次。