LOD

例句：

1. 1. The patient was admitted to the hospital for treatment of low oxygen.
   病人因低氧症被送往医院接受治疗。
2. 2. During the long flight, passengers should be aware of the risk of low oxygen.
   在长时间的飞行中，乘客应该意识到低氧的风险。
3. 3. The doctor prescribed a breathing mask for the patient in order to improve his low oxygen levels.
   医生为患者开了一个呼吸面罩，以改善他的低氧水平。