path of migration

例句：

1. 1. The path of migration is often markedby the presence of wildlife.
   迁移路径常常被野生动物的存在所标记。
2. 2. Themigration path of birds isa fascinating study in ecology.
   鸟类的迁徙路径是生态学中一个引人入胜的研究课题。
3. 3. Thepath of migration is not always easy foranimals to navigate.
   动物在迁徙过程中往往难以导航。