他们实际上在观测鱼向上游的迁移活动。
They actually monitor the movement of the fish going up river.
迁移活动是动物在有冲突的驱力下从事的活动。
Displacement activities are activities that animals engage in when they have conflicting drives.
对于本教程中讲解的迁移活动，需要以下环境。
For the migration exercise illustrated in the tutorial, the following environment is required.
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