请给我三个国际级别的马拉松赛事名称。这些信息需要用一个json格式来表示。每个赛事名称应附有英文和中文名称。格式应该如下：{"marathon1": {"en": "xxxx", "cn": "xxxx"}, "marathon2": {"en": "xxxx", "cn": "xxxx"}, "marathon3": {"en": "xxxx", "cn": "xxxx"}}
user
{"marathon1": {"en": "Boston Marathon", "cn": "波士顿马拉松"}, "marathon2": {"en": "New York City Marathon", "cn": "纽约市马拉松"}, "marathon3": {"en": "Berlin Marathon", "cn": "柏林马拉松"}}
assistant