'Let me be frank just this once, father.

“让我坦率地说， 就这一次，父亲。

So, madam ambassador, let me be frank. I have deep reservations about your lack of qualifications for such a complex and challenging role.

大使阁下，坦率地说，我很担心你是否能胜任这一复杂又充满挑战的职位。