最后一个层面是丰富多彩的语言创作。

The last level is creative and colorful language.

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最后一个项目涉及联世卫组织在各个层面的绩效。

The final item concerns the performance of WHO at all levels.

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争论最后集中到这样一个问题上，达尔文的物竞天择究竟是只发生在个体层面上，还是在群体层面上依旧有效。

And that controversy leads to another one. Does Darwinian selection take place at the level only of individuals, or of groups as well?

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