sources:
  - id: cambridge-official
    title: 剑桥官方 KET/PET 样卷、词表与听力音频
    publisher: Cambridge Assessment English / UCLES
    type: dataset
    url: https://www.cambridgeenglish.org/Images/
    license: official-free
    license_note: "官方免费发布，允许教学使用（样卷/词表/听力音频）"
    fetch_method: manual-download
    status: fetched
    fetched_at: "2026-08-21"
    items:
      - id: a2-key-vocab
        title: A2 Key 2020 词汇表 PDF
        oss_key: edu-raw/exams/ket/vocab/cambridge-official/a2-key-vocabulary-list.pdf
        sha256: null
        size: null
        media_type: application/pdf
        fetch_date: "2026-08-21"
        status: planned
        note: "vocab JSONL (structured/exams/ket/vocab/) 由此清洗；待 oss_sync 上传"
      - id: b1-preliminary-vocab
        title: B1 Preliminary 词汇表 PDF
        oss_key: edu-raw/exams/pet/vocab/cambridge-official/b1-preliminary-vocabulary-list.pdf
        sha256: null
        size: null
        media_type: application/pdf
        fetch_date: "2026-08-21"
        status: planned
      - id: a2-key-listening
        title: A2 Key 听力音频
        oss_key: edu-raw/exams/ket/audio/cambridge-official/a2-key-listening.mp3
        sha256: null
        size: null
        media_type: audio/mpeg
        fetch_date: "2026-08-21"
        status: planned
      - id: sample-papers
        title: 官方样卷包（PDF/MP3/ZIP）
        oss_key: edu-raw/exams/ket/sample_papers/cambridge-official/
        sha256: null
        size: null
        media_type: application/zip
        fetch_date: "2026-08-21"
        status: planned