是用信的形式?
Dear xxx,
I'm feel happy to invite you to join the Science Club,you know nowadays,tscience is becoming more and more important.In our daily life,we must know something about it,so we can organise a interest group to learn more about it.And we can learn from esch other about the thought of science. I hope your joinning.
Yours
xxx
给的条件有点模糊.不知道侧重点写什么.