[
  {
    "id": "1",
    "exhibitor_id": 1,
    "name": "智能设备",
    "description": "各类智能设备和机器人产品",
    "parent_id": null
  },
  {
    "id": "2",
    "exhibitor_id": 1,
    "name": "机器人",
    "description": "各类机器人产品",
    "parent_id": 1
  },
  {
    "id": "3",
    "exhibitor_id": 1,
    "name": "智能家居",
    "description": "智能家居相关产品",
    "parent_id": 1
  },
  {
    "id": "4",
    "exhibitor_id": 1,
    "name": "能源产品",
    "description": "各类能源相关产品",
    "parent_id": null
  },
  {
    "id": "5",
    "exhibitor_id": 1,
    "name": "太阳能",
    "description": "太阳能相关产品",
    "parent_id": 4
  },
  {
    "id": "6",
    "exhibitor_id": 1,
    "name": "风能",
    "description": "风能相关产品",
    "parent_id": 4
  }
]