求翻译：It is unusual to see large flocks of birds flying overhead in the summertime,rather tan during the periods of migration in the spring or fall是什么意思？

待解决

悬赏分：1 - 离问题结束还有

It is unusual to see large flocks of birds flying overhead in the summertime,rather tan during the periods of migration in the spring or fall

问题补充：

匿名	2013-05-23 12:26:38 它是看到大成群的鸟儿飞过的夏季，而是谭春在迁移期间或跌不寻常

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