opposing recoil怎么理解？

It needs to be stressed that the forces generated by the absorption of trapped gases are very large. The total partial pressure of gases in mixed venous blood is normally 87.3 kPa (655 mmHg). The corresponding pressure of the alveolar gases is 95.1 kPa (713 mmHg), allowing for water vapour pressure at 37°C. The difference, 7.8 kPa (58 mmHg or 78 cmH2O), is sufficient to overcome any forces opposing recoil of the lung. Absorption collapse after breathing air may therefore result in drawing the diaphragm up into the chest, reducing rib cage volume or displacing the mediasti­ num. If the patient has been breathing oxygen the total partial pressure of gases in the mixed venous blood is barely one­tenth of an atmosphere, and absorption of trapped alveolar gas generates enormous forces.

需要强调的是，吸收陷闭气体会产生的力非常大。如果将37°C的水蒸汽压力（译者注：37°C的水蒸汽压力为47mmHg）考虑进去，陷闭肺泡内的气体压力为95.1 kPa （713 mmHg，译者注：760-47=713）。而混合静脉血中气压通常为87.3kPa（655mmHg）。7.8kPa（58mmHg（译者注：713-655=58）或78cmH₂O）的差值足以克服任何肺弹性回缩力的反作用力。因此，呼吸空气时气体吸收后的肺萎陷可能会导致隔肌上移进入胸腔，使骨性胸廓（rib cage）容积下降及纵隔移位。如果患者一直在吸氧，那么混合静脉血中总气压仅为大气压的十分之一，肺泡内陷闭气体的吸收会产生巨大的作用力。

我理解的对吗？陷闭肺泡-混合静脉血中=58，是肺扩张的力，“肺弹性回缩力的反作用力”也是“肺扩张的力”，那为啥时克服？