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We do a bird count twice a year to study the changes in bird numbers.
我们每年数两次鸟儿,以研究鸟儿在数量方面的变化;
youdao
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Click + until the count is 5. Then, click Back twice.
单击+直到计数为5。然后,单击Back两次。
youdao
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Click + until the count is 5. Then, click Back twice.
单击+直到计数为5。然后,单击Back两次。
youdao