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The nasal cavity is divided into left and right halves by（）.
The nasal cavity is divided into left and right halves by（）.
正确答案：the septum
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动物解剖生理
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The nasal cavity, pharynx, larynx, trachea and （） are the channels for gas to enter and leave the lung, which are called respiratory tract.
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The widest（）is the main air passage from nostril to pharynx.