{
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  "dek": "加拿大总理卡尼（Mark Carney）周五晚发表措辞强硬的官方声明，正式宣布中止与美国的双边贸易谈判，并下令身在华盛顿的加拿大谈判代表团马上打道回府。这项决策直接宣告两国在关税生效期限前的最后谈判全面破裂。",
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      "published_at": "2026-08-22T08:19:12Z",
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      "title": "加拿大拒签“不平等”条约 准备向美国实施报复性关税",
      "url": "https://www.rfi.fr/cn/%E5%9B%BD%E9%99%85/20260822-%E5%8A%A0%E6%8B%BF%E5%A4%A7%E6%8B%92%E7%AD%BE-%E4%B8%8D%E5%B9%B3%E7%AD%89-%E6%9D%A1%E7%BA%A6-%E5%87%86%E5%A4%87%E5%90%91%E7%BE%8E%E5%9B%BD%E5%AE%9E%E6%96%BD%E6%8A%A5%E5%A4%8D%E6%80%A7%E5%85%B3%E7%A8%8E",
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  "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.",
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      "evidence_item_id": "item-392e19ba648f3b6ad5737dc6",
      "published_at": "2026-08-22T08:19:12Z",
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