雁阵是一个人字形，一个鸟不是。三个人字形是三个雁阵

来源: letstalk 于 2009-05-01 17:51:54 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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雁阵 是一个人字形，一个鸟不是。三个人字形是三个雁阵