Either of two spongy,saclike respiratory organs in most vertebrates,occupying the chest cavity together with the heart and functioning to remove carbon dioxide from the blood and provide it with oxygen.
英
美
- 肺大多数脊椎的物的两个海绵状的,囊状的呼吸器官,它和心脏一起占据胸腔,作用是从血液中排出二氧化碳和使血液吸收氧气。