没有迁移计划。
没有更多的研究，我们无法预测辅助迁移是否适用于某一特定的物种。
Without more research, we can't predict if Assisted Migration will work for any given species.
人们常常假设，但没有证据证明，在所谓的“大迁移”中，大多数移民来自农村地区，这是由两个同时发生的因素推动的。
It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors.
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