Inspiratory muscles are muscles that increase the volume of the thoracic cavity.

吸气肌是增加胸腔容积的肌肉。

During expiration, the diaphragm moves up, the pressure in the thoracic cavity reverses.

呼气期间，膈肌向上移动，胸腔内的压力逆转。

The thoracic cavity includes other organs such as the heart and esophagus.

胸腔还包括其他器官比如心脏和食管。

There are branches that feed your esophagus, which lies deep and runs through your thoracic cavity.

食道深埋并贯穿胸腔，食道的分支为食道提供营养。

The illustration above shows the lungs within the thoracic cavity.

上述讲解说明，双肺位于胸腔内。

The left lung contains what we call the cardiac notch, as the heart takes up this space within the thoracic cavity.

左肺包括我们称为是心脏切记的位置，因为心脏在胸腔内占据这个空间。

In order to understand how we breathe, we need to understand the different spaces and pressures within our thoracic cavity.

了解人体呼吸机制前，我们需要理不同的间隙与解胸膜腔内的压力。

During inspiration, the diaphragm moves down, expanding the thoracic cavity, resulting in a decreased intra-thoracic pressure and a subsequent expansion of the lungs.

吸气过程中，膈肌向下移动，胸腔扩张，导致胸腔内压力降低，随后肺部扩张。

Lungs are contained within the thoracic cavity, the section of the human body encased by the rib cage and separated from the abdominal cavity by the diaphragm.

肺脏被胸腔包含在内，人体的这一部分被胸腔包裹并且由膈把它与腹腔隔开。

As the inferior vena cava passes through both abdominal and thoracic cavities, an increase in abdominal pressure together with a decrease in thoracic pressure squeeze the blood upward- toward the heart.

当下腔静脉同时通过腹腔和胸腔时，腹腔压力增加和胸腔压力降低会将血液向上挤压—流向心脏。