The first reported event of this kind in the United Stateshappened in Donora.
美国首次报告的这类事件发生在多诺拉。
The first reported event of this kind in the United States happened in Donora, a factory town in a valley near Pittsburgh.
据报导，在美国的第一起这类事件发生在靠近匹兹堡的多诺拉。多诺拉是一个城镇，那里全是工厂。
The first reported event of this kind in the United States happened in Donora, a factory town in a valley near Pittsburgh.
据报导，在美国的第一起这类事件发生在靠近匹兹堡的多诺拉。多诺拉是一个城镇，那里全是工厂。
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