public class Lang
    {
        public string En;
        public string Ch;
    }

  List<Lang> langs = new List<Lang>();
            langs.Add(new Lang() { Ch = "书籍", En = "Book" });
            langs.Add(new Lang() { Ch = "电影", En = "Film" });
            var dict = langs.ToDictionary(x => x.Ch, x => x.En);

            var value = dict["书籍"];