肺炎是重感冒后一种常见的并发症。

Pneumonia is a common ___complication following a severe case of influenza.

手术后出现了一个严重的并发症，需要进一步的医疗干预。

A serious ___complication arose after the surgery, requiring further medical intervention.

医生在她从感染中恢复期间，对任何潜在的并发症都保持警惕。

The doctors were vigilant for any potential ___complication during her recovery from the infection.