名词
中文翻译：外层
同义词：
['outer layer', 'outermost layer', 'outer covering']
例句：
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1. The scientist carefully removed the adventitia to examine the inner structure of the bone.
科学家小心翼翼地移除了外层以检查骨骼的内部结构。
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2. The outer layer of the skin is responsible for protecting the body from external factors.
皮肤的外层负责保护身体免受外部因素的伤害。
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3.The adventitia plays a crucial role in maintaining the integrity of the tissue.
外层在保持组织完整性方面起着至关重要的作用。