这似乎是一种适应，它允许人类迁移到新的不同的地区，为改变生活习惯提供了机会。
It seems to be an adaptation, which allowed humans to move into new and different areas, opening up the opportunity to change living habits.
当印第安人往南迁移时，他们必须习惯新气候。
The Indians had to get adapted to a new climate AS they moved south.
对于外语学习者来说，已形成的母语发音习惯对于新语言语音的学习具有负迁移作用。
For foreign language learners, the habits that they have in pronunciation of their mother tongue play a negative role when they learn a new language pronunciation.
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