The message came from no less a person than the prime minister.

【less】电文竟是首相发来的。

Dear Ron, I have only just heard (from no less a person than the Minister for Magic himself, who has it from your new teacher, Professor Umbridge) that you have become a Hogwarts prefect.

我刚刚才听说（从魔法部部长本人那里获悉，他是昕你们的新老师乌姆里奇教授说的）你已经成为霍格沃茨的一名级长了。