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豬傳染性胸膜肺炎是由胸膜肺炎放線桿菌引起的一種高度接觸性、致死性呼吸道傳染病。以急性出血性纖維素性胸膜肺炎和慢性纖維素性壞死性胸膜肺炎為特征。多呈最急性型或急性型病程，突然...
Andrew Grey doesn’t fit most people’s idea of an astronomer天文學(xué)家. He works in a car repa...
The tally(總計) by Johns Hopkins University shows that deaths in the US, Brazil and India...
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