呼吸系统包括鼻腔和肺。
The respiratory ___tract includes the nose and lungs.
她在教堂分发了一些关于信仰的小册子。
She handed out ___tracts about faith at the church.
呼吸道感染会影响整个呼吸系统。
Respiratory infections can affect the entire ___tract.
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