Secondly, it is true that Chinese people of today have no choice but to suffer from enormous employment stress / life pressure / academic stress / job stress / social pressure // fierce competition // boring and monotonous life. As a result, sth./doing sth. has become their first choice // has been placed at the top of their agenda, which may result from a popular belief that…+结论句.
Secondly, it is true that college students of today have no choice but to suffer from peer pressure. As a result, traveling around the world has become their first choice to reduce stress.
Para 1. 表明写信目的
Para 2. 介绍慈善义卖的细节（时间，地点，意义，领导讲话）
Para 3. 号召同学来参加 + 结束语
Dear Mr. Smith,
Dear Ms. Jenny,
Dear Prof. Williams,
Dear Sir or Madam,
It has been a while since we met last time.
I hope everything goes well with you.
My name is Li Ming, a customer of your online store.
My name is Li Ming, a fresh graduate of Peking University.
I am writing to…
介绍信：introduce… in more details
感谢信：express my gratitude to you for…
道歉信：express my sincere apologies to you for not being able to…
投诉信：express my dissatisfaction with…
邀请信：invite you to….
推荐信：recommend… to you for…
I was sorry to hear that…+回顾对方的窘境. I would like to give you some tips to help you get out of trouble.
I would like to give you some tips about….
I was glad to hear that…+回顾对方的成就. Congratulations! I am incredibly proud of your achievement.
I was excited to learn of the job opportunity from your official website, so today I am writing to apply for the position of…
I would like to inform you that I am resigning from my position.