题目内容
89. (一些种类的鲨鱼数量已经下降超过百分之九十) in the last 20 to 30 years. (number)
89. The numbers of some kinds of sharks have fallen by over 90 percent
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89. (一些种类的鲨鱼数量已经下降超过百分之九十) in the last 20 to 30 years. (number)
89. The numbers of some kinds of sharks have fallen by over 90 percent
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