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The lungs are organs that are part of the respiratory system. They allow your body to take in oxygen from the air. They also help remove carbon dioxide from the body.The entire respiratory system works together to breathe air in and out of the lungs. This includes the nose, mouth, larynx, trachea and the bronchial tubes within the lungs.
肺是呼吸系統器官的一部分。肺使機體能從空氣中吸收氧氣，并將二氧化碳排出體外。整個呼吸系統一起工作使氣體進出肺。呼吸系統包括鼻、口腔、咽、氣管和肺內的支氣管。
Air enters the lungs when we breathe in because the lungs expand. The lungs expand when nearby muscles contract to make the chest cavity larger. These muscles include the dome-shaped muscle called the diaphragm, and the muscles of the rib cage. As the muscles contract and the lungs expand, air is sucked through the nose and mouth.
當吸氣時，氣體進入肺，因為鄰近的肌肉收縮時胸腔擴大使肺擴張。這些肌肉包括穹頂狀的膈肌，還有胸腔肌肉。當肌肉收縮，肺擴張，氣體被吸進鼻和口腔。
This is known as inhalation. Your nose filters, wets, and warms the air before it passes through the larynx, trachea and the bronchial tubes within the lungs. At the same time, the heart pumps blood rich in carbon dioxide and low in oxygen, to the lungs through the pulmonary arteries. The pulmonary arteries end in a mesh of tiny blood vessels called capillaries. This mesh surrounds the round air sacs called alveoli. The alveoli are like bunches of grapes at the end of the bronchial tubes. When you inhale, air flows down the bronchial tubes and into the alveoli. This inhaled air is oxygen-rich.
這就是吸氣。在氣體通過咽、氣管和肺內的支氣管之前，鼻腔會過濾、加溫和加濕空氣。與此同時，心臟將富含二氧化碳的低氧血通過肺動脈泵入肺。肺動脈最終形成小血管網—毛細血管。毛細血管圍繞在充滿空氣的圓腔——肺泡周圍。肺泡位于支氣管的末端，就像葡萄串一樣。當吸氣的時候，空氣流入支氣管進入肺泡。吸入的空氣是富含氧的。
