bullfrogs造句

Since ten years ago, it was bullfrogs, geese, ducks.
十年前就有牛蛙, 鹅, 鸭子什么的.

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.

Although bullfrogs were introduced into mainland China 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.

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