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      "sizes": "512x512",
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    }
  ],
  "shortcuts": [
    {
      "name": "PET 词汇",
      "short_name": "PET",
      "description": "开始学习 PET 考试词汇",
      "url": "./flashcard.html#pet",
      "icons": [{ "src": "icons/icon-192.png", "sizes": "192x192" }]
    },
    {
      "name": "日常口语",
      "short_name": "口语",
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