In general, wakefulness in animals is a survival function needed to feed and to keep predators away.

一般的，动物睡眠比较浅以保证远离捕食者。

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Methods Analyzing the Survival function of the original lifetime data, and developing Linear Regression Equations by means of related analysis data.

方法对原始寿命数据进行生存函数分析，并利用相关的分析数据建立线性回归方程。

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On the other hand, many evolutionary biologists, in contrast to animal behaviorists, acknowledge some emotions primarily for their survival function.

另一方面，与动物行为研究学家相反，许多进化生物学家认为情感的主要作用还是帮助生存。

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The trial did not meet its primary endpoint, a joint rank analysis of function and survival, and no efficacy was seen in the individual components of function or survival.

FORBES: Biogen Idec ALS Drug Fails

Universality, costliness and genetic control all suggest that music has a clear function in survival or reproduction, and Dr Miller plumps for reproduction.

ECONOMIST: Human evolution

Yet they did no better than other patients, whether this was measured in terms of survival, their ability to function, or satisfaction with the care they received.

NEWYORKER: The Cost Conundrum