upper bend

• 背斜,鞍廓,向上拱,柩扭

upper bend的用法和样例：

例句

1. During quiet breathing, inspired gases will preferentially go to the more distensible upper lung units leading to an uneven distribution of gases.
   然而，这种不同顺应性的肺区都处于越来越僵硬的胸廓之中，老年僵硬的胸壁加重肺弹性减弱对呼吸的影响。