现在，迁徙是一种自然的生存策略。
鲑鱼在河流和海洋之间迁徙时也会携带危险的化学物质。
Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.
无论如何定义，动物迁徙都远远不止是动物的移动。
Animal migration, however it is defined, is far more than just the movement of animals.
无需人工帮助的物种迁徙也只能维持几个月的时间。
There are a few quarters left for species to migrate through without help.
当迁徙只是生存的习惯，再好的风景也是枉然。
When migration is the habit of being, it is a good scenery is also vain.
当迁徙只是生存的习惯，再好的风景也是枉然。
When migration is the habit of being, it is a good scenery is also vain.
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