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春夏之交，到处都是生机勃勃，此时天空倒有两只孤雁，正在奋力北飞，成群的大雁要就已经北归了，却不知这两只缘何迟了。

大雁飞过天空，许是为了给同伴鼓舞，时而传出“嘎······嘎······”的长音，吸引了地上人儿的注意。

官道上正走来十来个