US 'closely monitoring' after Russian lab worker 'dies of suspected plague'
Marco Rubio has said the US is "closely monitoring" the case involving the death of a laboratory worker in Russia who may have been exposed to pneumonic plague.
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未配置 LLM_API_KEY，本内容为确定性模拟输出。配置 LLM_API_KEY / LLM_BASE_URL / LLM_MODEL 后将由大模型生成真实的词汇标注、句法分析与背景卡片。
你是一位大学英语四六级（CET-4/6）教研专家。请分析下面的英文文章，输出严格 JSON（不要 markdown 代码围栏），结构如下： { "wordLevels": { "<word>": "cet4" | "cet6" | "beyond" }, "sentences": [{ "text": string, "translation": string, "analysis": string }], "summaryZh": string, "backgroundCards": [{ "term": string, "explanation": string }] } 要求：wordLevels 收录文中值得关注的四六级及超纲词汇（小写原形）；sentences 选取 5-10 个长难句给出中文翻译与句法分析；summaryZh 为 100 字以内中文摘要；backgroundCards 提供 2-4 张背景知识卡片（中文解释）。 标题：US 'closely monitoring' after Russian lab worker 'dies of suspected plague' 正文： Marco Rubio has said the US is "closely monitoring" the case involving the death of a laboratory worker in Russia who may have been exposed to pneumonic plague.