คำว่า
a clean bill of health
a clean bill of health ความหมายคือ a clean bill of health 1. (船只经检疫后的)无疫证明书 2. 〈口〉清白证明；表现良好证明；合格证明 He was suspected in the bank robbery, but the police gave him a clean bill of health. 他有参加抢劫银行的嫌疑，可是警察当局证明他无罪。The vaccine was given a clean bill of health. 这种疫苗被认为合格。
