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The tracheal wall is divided into three layers: mucosa, submucosa and（）.
The tracheal wall is divided into three layers: mucosa, submucosa and（）.
正确答案：adventitia
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动物解剖生理
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The narrow gap between the vocal cords on both sides is called（）. When the air flows through, the vocal cords vibrate to produce sound.
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The submucosa of trachea is（）tissue, which contains trachea glands, blood vessels and nerves.