名词
中文翻译：核心鞘
同义词：
['core layer', 'core membrane', 'core sheath']
例句：
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1.The core sheath is a thin layer of tissue that protects the heart during its operation.
核心鞘是一层保护心脏在工作时的薄组织。
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2. The inner core sheath is made up of a network of blood vessels and nerves.
内核心鞘由血管和神经网组成。
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3. The outer core sheath is composed of connective tissue and serves as a barrier between the heart and the body.
外核心鞘由结缔组织组成，作为心脏与身体之间的屏障。