Welcome the theachers and students from Loy Norrrx High Shcool or Columbine Senior Shcool to our shcool for visiting ang studying.from Loy Norrrx High Shcool or Columbine Senior Shcool to our shcool for visiting ang studying.“or”几个学校是一起来的是不是要用and “ for visiting ang studying.” for visiting and studying.?恩恩，感觉and 要好吧，不是参观学习吗