special letter meaning in English

专函

I am going to read a special letter
我准备读一封很特别的信
The center later received a special letter of appreciation for the work of our fellow initiates . letter enclosed
活动后，我们收到一封他们透过电子邮件寄给小中心的谢函如附件。
On 23 june 2004 , the british ambassador , sir christopher hum , visited a very remote primary school in gansu province , china to personally deliver a special letter from the british prime minister , tony blair to a 3rd grade minority schoolgirl . ma jin hua studies in qiaolu primary school , dongxiang county about 4 hours drive across mountainous terrain from lanzhou
2004年6月23日，冒着蒙蒙细雨，英国驻华大使韩魁发爵士及其夫人作为“信使” ，带着英国首相托尼布莱尔给马金花等四个小姑娘的信来到甘肃临夏回族自治州东乡县乔鲁小学，将信亲手交给该校三年级学生马金花。