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观鸟俱乐部的成员们正在研究不同种类的鸟以及它们数量上的变化。
The members of the Birdwatching Club are studying the different kinds of birds and the changes in their numbers.
youdao
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观鸟俱乐部的成员们正在研究不同种类的鸟以及它们数量上的变化。
The members of the Birdwatching Club are studying the different kinds of birds and the changes in their numbers.
youdao