假设你暑假参加了你所在社区组织的义工(volunteer)活动。请给你的美国朋友Tom写一封英文电子邮件，与他分享你的感想。内容包括：
1.你做了什么义工工作
2.你认为做义工的意义是什么
3.请以Li Ke署名
Dear Tom,
I have been a volunteer in 2010 Shanghai EXPO, it was really an unforgettable experience. Although volunteer's work was hard and tired, I still feel very happy.Because it offers me a good opportunity to help visitors from foreign counties thus can practice my oral English. I also enhance my sense of reasonability during volunteer work. I worked with other volunteers as a team, together we solved different problems, we also became good friends after EXPO. I was proud of myself and surely I will treasure this experience.
Yours LiKe
2017.04.20
