Objective To analyse the current status of acute poisoning in Xuzhou by epidemiology, exploring its causes and providing preventive measures.

目的对徐州市急性中毒现况进行流行病学分析，并进一步探索其原因，提出针对性预防措施。

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For revealing and exploring climate change and its causes, Granger causality test is introduced in this paper.

为揭示气候变化并探索其可能原因，引入了格兰杰因果检验法。

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