Question: 第一步移动电话是何时出现的
Answer: 1973; 1973; 1973-04-03; 1973-04-03; 04/03/1973; 1973 april, 03; 03 04 1973; 04 03 1973; 03-04-1973; 03 4月 1973; 1973 4月 03; 04-03-1973; 03/04/1973; 1973 04 03