三凹征指的是，当你孩子试着努力呼吸时，你可以看到肋骨。

Retractions are when you can see the ribs when your child is trying to breathe.

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目的探讨多根多处肋骨骨折的手术内固定治疗与急性呼吸窘迫综合征(ARDS)的防治。

ObjectiveTo discuss the surgical treatment for multiple fractures of multiple ribs with internal fixation and the prevention and treatment of respiratory distress syndrome (ARDS).

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