第一节参考范文：Dear Mr Smith,I am Li Hua,chairman of the Students'Union.I'mwriting to extendourearnestinvitationforyourparticipation in the 9th Space Day celebration in our school.To mark the remarkable achievements of China'saerospace industry and inspire the young to admire science,explore the unknown and embrace innovation,we haveplanned a series of exciting activities for the occasion,including guest lecturesfromexperts in the field,interactive workshops on space technology,and a modelrocket launch in the evening.We would be honored if you could join us for thisspecial day on 24th,April.Looking forward to yourfavorable response.Yours sincerely,Li Hua
