我们在量比较长的物体或距离的时候，通常用什么作单位，它可以用什么字母表示？
假如你是李华，你的朋友peter将来中国旅行，请写信邀请他来你家乡玩，外语作文， Hi Peter，I've heard that you are coming to China in near future.I'd like to invite you to my hometown to visit.I can show you around my hometown.It will be fun.I live in a small town，not a big city like Beijing or Shanghai.It's a lot quieter and cleaner.And there are some tourist attractions.We have a really old temple from Ming dynasty，it's very historical and worth a visit.I can introduce you the stories behind the temple.I hope you consider to visit my hometown.Much appreciated.Yours，Hua Li
