The noise in the zoo turned out to be the croaks of bullfrogs.
动物园里喧噪得很,原来是一群牛蛙在叫
Bullfrogs became lethargic with the first cold nights.
在开始的那些寒冷夜晚,牛蛙变得无精打采.
Since ten years ago, it was bullfrogs, geese, ducks.
十年前就有牛蛙, 鹅, 鸭子什么的.
Although bullfrogs were introduced into Chinese mainland in 1959, they were not wildly raised until 1990.
1959年牛蛙被引入中国大陆, 但直到1990年才开始在国内大范围饲养.
Many of the bullfrogs shipped out of South America are infected with chytrid fungus.
许多被海运出南美的牛蛙都感染了壶菌霉菌。
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