a decision by a doctor that someone is healthy

He's been given a clean bill of health by the doctor. 他拿到了一份医生出具的健康证明。

a decision by someone in authority that a particular thing is in good condition

Of 30 countries inspected for airline safety, only 17 received a clean bill of health. 在对30个国家的航班安全性检查中，只有17个国家获得了安全证书。