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》

Take a quick break during the day to work the triceps, chest muscles and back.

稍作休息后开始锻炼三头肌、胸肌和背部。

youdao

Slouching or rolling your shoulders forward shortens your chest muscles and reduces their flexibility.

肩膀低垂或是内旋会使胸肌缩短并且弹性降低。

youdao

To move an arm, the brain sends a message that causes the chest muscles to tighten.

VOA: special.2009.03.10

TMR surgically connects the remaining nerves to chest muscles.

VOA: special.2009.03.10

In stage IIIB breast cancer, a tumor of any size has spread to tissues near the breast the skin and chest muscles and may have spread to lymph nodes within the breast or under the arm.

CNN: Breast cancer staging

The virus, injected into the chest and limb muscles, is soaked up by motor neurons.

FORBES: Gene Therapy Slows A Killer

He acted with his creased brow, his jagged bone structure, and his narrowed eyes, as well as with the muscles in his chest, shoulders, and neck.

NEWYORKER: Mr. Majestyk