为了应对逐渐变化的气候，一些物种改变了活动范围，已经迁移到数百公里以外的地方。
In response to these gradual climatic swings, some species have shifted their ranges hundreds of kilometers.
什么是范围渐变？
如上面的定义所述，范围渐变的基本原因时常涉及需求这一主题。
As the definition above stated, the fundamental cause of scope creep more often than not revolves around requirements.
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