我们经常清点鸟的总数以便研究它们在数量方面的变化.We often the birds to study the in their numbers. 题目和参考答案——青夏教育精英家教网—

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3. 我们经常清点鸟的总数以便研究它们在数量方面的变化。

We often the birds to study the in their numbers.

3. count; in order; changes

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