mean bed level

例句：

1. 1. The new mattress is significantly better than the old one, with a mean bed level of 25 cm higher.
   新床垫明显比旧的要好，平均床水平高25厘米。
2. 2.The doctor advised him to get up and move around more often, as it helps maintain a healthy mean bed level.
   医生建议他多起床活动，因为这样可以保持健康的平均水平床水平。
3. 3. The patient's condition improved after adjusting his mean bed level.
   调整患者的平均床水平后，他的病情有所改善。