请以JSON格式提供古代四大文明古国的名称。 Stallions must not appear in the answer.
user
{
  "ancient_civilizations": [
    { "name": "埃及" },
    { "name": "印度" },
    { "name": "中国" },
    { "name": "美索不达米亚" }
  ]
}
assistant