The middle trapezius and rhomboids draw the shoulder blades toward the spine, opening the front of the chest.
中斜方肌和菱形肌将肩胛骨向脊柱的方向拉，使胸廓前侧打开。
Muscles spanning the upper back, the middle trapezius and rhomboids, pull the shoulder blades towards the spine to open the front of the chest.
中斜方肌和菱形肌(贯穿上背部的肌肉)将肩胛骨向脊柱的方向拉，从而打开胸廓。
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