请根据以下关键字的定义生成一个JSON格式的定义列表，这组关键字的定义需要结构化，并且每个关键字都有定义：apple, banana, cat, dog, elephant
user
```json
{
  "definitions": [
    {
      "keyword": "apple",
      "definition": "A round fruit with smooth green, yellow, or red skin and firm white flesh."
    },
    {
      "keyword": "banana",
      "definition": "A long, curved fruit with a yellow skin and soft, sweet flesh inside."
    },
    {
      "keyword": "cat",
      "definition": "A small domesticated carnivorous mammal with soft fur, a short snout, and retractable claws."
    },
    {
      "keyword": "dog",
      "definition": "A domesticated carnivorous mammal that typically has a long snout, an acute sense of smell, non-retractable claws, and a barking, howling, or whining voice."
    },
    {
      "keyword": "elephant",
      "definition": "A very large plant-eating mammal with a prehensile trunk, long curved ivory tusks, and large ears, native to Africa and southern Asia."
    }
  ]
}
```
assistant