你的朋友Jim对中国的新四大发明（共享单车shared bikes、高铁high-speed rail、在线支付E-payment、网购shopping online）很感兴趣，希望你向他介绍一下。请选择其中一项发明，写一篇不少于70词的英语邮件。文中不得出现具体的人名、校名等个人信息，否则不予评分。（开头和结尾已经给出，不计入总词数。）
Dear Jim，
_____________________________________
Yours，
Lin Min

【考点】应用文；厉行节约．

【答案】Dear Jim，
Glad to hear from you.Knowing that you are interested in China's"four great new inventions"，especially our high-speed trains，I'd like to give a brief introduction to you.
China's high-speed rail runs at a speed of 250-350 km per hour，providing people with a convenient and popular transport choice.Besides，it's equipped with comfortable seats and a free wireless network.Furthermore，because of its various advantages，it has come to the global attention and many countries have imported Chinese high-speed rail technology to upgrade their own rail transport systems.
I hope that the information above will be helpful to you.If you have any further questions，please don't hesitate to contact me.