"∅-" meaning in 納瓦霍語

{
  "categories": [
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "納瓦霍語前綴",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "納瓦霍語詞元",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "納瓦霍語",
  "lang_code": "nv",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "有使用例的納瓦霍語詞",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "yibéézh",
          "translation": "它被煮沸(yi-∅-béézh)"
        },
        {
          "text": "yiłbéézh",
          "translation": "他在煮它(yi-ł-béézh)"
        }
      ],
      "glosses": [
        "語態中綴-∅-用於表示沒有前綴，通常將主動動詞標記為不及物動詞。"
      ],
      "id": "zh-∅--nv-interfix-TjbQUvUx"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "∅-"
}

{
  "categories": [
    "有1個詞條的頁面",
    "納瓦霍語前綴",
    "納瓦霍語詞元"
  ],
  "lang": "納瓦霍語",
  "lang_code": "nv",
  "pos": "interfix",
  "senses": [
    {
      "categories": [
        "有使用例的納瓦霍語詞"
      ],
      "examples": [
        {
          "text": "yibéézh",
          "translation": "它被煮沸(yi-∅-béézh)"
        },
        {
          "text": "yiłbéézh",
          "translation": "他在煮它(yi-ł-béézh)"
        }
      ],
      "glosses": [
        "語態中綴-∅-用於表示沒有前綴，通常將主動動詞標記為不及物動詞。"
      ]
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "∅-"
}