信的主要内容包括以下几点:

1. 北京的“排队日”有助于人们享受更轻松、更和谐的生活,其它城市可借鉴;

2. 一些人在购物或等车时不排队,定一个“排队日”是对他们的提醒,这样,人们会逐渐养成自觉排队的好习惯;

3. 希望每天都成为“排队日”,这样,我们的社会更加美好。

注意:1. 不必逐条翻译,可适当发挥;

2. 词数:100左右;

3. 参考词汇: 排队日lining-up day; 和谐的harmonious

one possible version:

dear editor,

a lining-up day has been set in beijing and it helps people enjoy an easier and more harmonious life. this has set a good example for other cities. nowadays, some people are unwilling to line up when they are doing their shopping or waiting for the bus, so i think it is necessary to establish a lining-up day to remind them. in this way, people will form the good habit of lining up voluntarily. i do hope that we will stick to this practice and popularize it until each day becomes a lining-up day. i’m sure it will make a big difference and our society will become more and more pleasant.

yours,

li hua