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mass outbreak 【蟲類】(瘟疫、蟲害等)突然蔓延;大規模流行。

mass psychology

China has reported another mass outbreak of avian flu in a flock of birds - the third such incident in the past eight days 中國在8天內第3次報告禽鳥中發生了大規模禽流感疫情。

It is the second such reported mass outbreak in china in a week 這是中國一周內報導的第二起大規模疫情。