Contraction of the diaphragm and the muscles Between the ribs draw air into the lungs through the trachea, which splits into two primary Bronchi, one per lung.
横膈膜以及肋骨间肌肉的收缩把空气通过气管吸入肺内，气管分成两根主支气管分别通向两侧的肺。
Contraction of the diaphragm and the muscles Between the ribs draw air into the lungs through the trachea, which splits into two primary Bronchi, one per lung.
横膈膜以及肋骨间肌肉的收缩把空气通过气管吸入肺内，气管分成两根主支气管分别通向两侧的肺。
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