In breathing the chest muscles expand the rib cage and allow air to be sucked into the lungs.
呼吸时胸部肌肉使胸廓扩大让空气吸入肺部。
《牛津词典》
2
She threw balls in the air and caught them in the arches of her feet, above the swell of her belly, between her chin and chest.
她把球抛到空中，然后用足弓，或她的肚子，或在下巴与胸口之间接住它。
3
You probably noticed that your shoulders raised, your chest cavity expanded and you felt the air in the upper part of your stomach. If you didn't, try it again.