假如你是李华,你有一位正在学习汉语的美国网友Sam,最近他给你写了一封电子邮件,地现在中国盛行的一些网络语言诸如：“给力

假如你是李华,你有一位正在学习汉语的美国网友Sam,最近他给你写了一封电子邮件,地现在中国盛行的一些网络语言诸如：“给力、神马”等颇有不解.请你用英语写一封邮件回复答疑,并对现在的网络语言万千现象发表你的看法.
要求：词数100左右.信的开头和结尾已经给出,但是不计入总词数.
Dear Sam,Glad to hear from you Best wishes!Yours,LiHua

Dear Sam,
Glad hear from you!I know, it's hard too understand lots of Internet words. I'm going to explain geili and shenma. Geili means something or someone is quite useful and available. When you need help, Geili represents active actions. Shenma means what, because the pronounciation of 什么 and 神马 in Chinese have partial similarity.
In my opinion, these words show the divesity of Chinese culture. Some of them may informal words, but we use them in our daily life. As to you, some new words are not easy, but when you get in to our culture, I believe you can grasp the pattern of these words.
Yours, LiHua