摘要:A kindergarten teacher in the central province of Henan was detained—accused of adding sodium nitrite, which can be toxic in large doses, to the meal boxes of at least 23 pupils late last month. 这
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A kindergarten teacher in the central province of Henan was detained—accused of adding sodium nitrite, which can be toxic in large doses, to the meal boxes of at least 23 pupils late last month. 这个句子的主干部分是：A kindergarten teacher in the central province of Henan was detained.破折号后面的内容是对A kindergarten teacher in the central province of Henan was detained部分的原因的解释。在破折号后面的部分中，句子的主干是accused of adding sodium nitrite to the meal boxes of at least 23 pupils late last month.中间的which can be toxic in large doses是一个which引导的非限定性定语从句，说明sodium nitrite的性质。
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