{
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    "relation": "topic-surface-only",
    "scan_signal_ids": []
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  "dek": "加拿大总理马克·卡尼周六宣布，将对美国钢铁和乳制品采取报复性措施，此前加拿大拒绝了华盛顿提出的“糟糕协议”。目前，加美关系正处于历史低点。卡尼在新闻发布会上表示，这些措施将于9月8日生效，同时还将影响造纸业、农业机械和电子产品。",
  "desk": "politics",
  "event_id": "event-c32d2e5983a75ae795efc280",
  "evidence_groups": [
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      "published_at": "2026-08-22T20:43:58Z",
      "role": "media",
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      "source_name": "RFI",
      "title": "美国对加加征关税后 马克·卡尼重手回击",
      "url": "https://www.rfi.fr/cn/%E7%BE%8E%E6%B4%B2/20260822-%E7%BE%8E%E5%9B%BD%E5%AF%B9%E5%8A%A0%E5%8A%A0%E5%BE%81%E5%85%B3%E7%A8%8E%E5%90%8E-%E9%A9%AC%E5%85%8B%C2%B7%E5%8D%A1%E5%B0%BC%E9%87%8D%E6%89%8B%E5%9B%9E%E5%87%BB",
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  "evidence_strength": "single-source",
  "headline": "美国对加加征关税后 马克·卡尼重手回击",
  "lead": false,
  "lead_reason": "Current single-source metadata is retained but not promoted as a lead.",
  "limitations": [
    "Palimpsest retained only feed title, canonical link, time, and a bounded plain-text excerpt; it did not fetch the article body.",
    "The evidence-strength label describes source structure, not truth, intent, impact, or causation.",
    "Declared instrument links are topical pointers until a separate scan or economic observation is joined by time and method.",
    "Title-similarity clustering can miss differently worded or cross-language accounts and can join closely worded updates.",
    "This dossier currently contains one independent evidence group and remains explicitly attributed."
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  "mutation": {
    "kind": "new",
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  "published_at": "2026-08-22T20:43:58Z",
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      "evidence_item_id": "item-4fd4bb1d7124cb74f6cf9064",
      "published_at": "2026-08-22T20:43:58Z",
      "statement": "RFI published “美国对加加征关税后 马克·卡尼重手回击”."
    }
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  "topics": [
    "economy",
    "politics",
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  "updated_at": "2026-08-22T20:43:58Z",
  "url": "https://palimpsest.info/news/wire/event-c32d2e5983a75ae795efc280/",
  "version_id": "eventv-0d49e62964fe24c9e21cb2d8"
}