例： The human brain needs to be without oxygen for only four minutes before permanent damage occurs.
人脑缺氧4分钟就会造成永久性损伤。
例： The baby was put in an incubator with an oxygen mask.
婴儿被放入一个有氧气罩的暖箱中。
例： the ability of the blood to carry oxygen to the heart.
血液把氧气输至心脏的能力。