单词：migratory bird
migratory bird的用法和样例：
例句
- Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
- Many see migration as part of a yearly cycle of changes a bird goes through.许多人把候鸟的迁徙看作是鸟儿每年所要经历的循环的一部分。
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