It is closely related with population genetic structure, environment heterogeneity and song learning.

它不仅与种群的遗传有关，而且与环境的异质性以及鸣声学习有关。

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This is obviously an area of great concern to the entire world, and to America in particular, which is to see a complete change in the structure and the environment in the Middle East.

WHITEHOUSE: The White House

We will explore the effects of irrelevant information on our decisions (chapter 7), examine why subtle differences in the way a question is framed lead to different solutions (chapter 8), and discuss how the structure of our environment can cause us to veer off track (chapter 9).

FORBES: Why Do Our Decisions Get Derailed?

Nadel points out that given the harsh environment such a structure was a particularly impressive accomplishment.

CNN: Mysterious structure found at bottom of ancient lake