Paris invents new love messages declarations of undying devotion will flash across paris ' s municipal bulletin boards every 20 seconds next month as the french capital invents a new way to say " i love you " on valentine ' s day 法国首都巴黎发明了一种在情人节这天说“我爱你”的新方法,下个月中巴黎市各处的市政公告牌上每20秒就会有表达不渝热爱的宣言闪过。