英语翻译教授您好：我是来自中国的留学生……,由于昨天下午做了个手术,回复晚了,对不起.事故后,我在韩国医院呆了两天,父母

Dear Sir,
I'm a student from China... I apologize to you for my belated reply due to an operation last afternoon. After the accident, I stayed 2 days in a hospital of South Korea. And then I was took by my parents to China for treatment. Here 2 hospital certificates (in Chinese and English versions) are attached. I feel very sorry to trouble you.
教授之类的称呼不宜直译.不合英文习惯.