The most important factor for the survival of a species is its ability to compete and adapt to gradual changes in its environment.

一个物种最重要的生存因素是它的竞争能力和适应环境逐渐变化的能力。

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The key factor to these solutions is that they possess the ability to be scaled up and down, so that users get the resources they need: no more and no less.

这些解决方案的关键因素是它们能够扩展和收缩，使用户能够获取正好适合他们需求的资源：既不多也不少。

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Smoking is a known risk factor for TB, and may reduce the ability of the lungs to fight off infection.

吸烟作为导致肺结核的一个常见的风险性因素，会削弱肺部抗感染的能力。

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After extensive research, the fire service decided that condoms - rather than pens, rulers, etc - packaged in a cardboard envelope bearing the core message, had the best novelty factor and the ability to communicate a wider safety message.

BBC: Fire service condoms for students

Surprisingly, the final factor for the ability of a practice to become an ensemble is the size of its typical (target) client.

FORBES: Should You Merge Your Firm Or Stay Solo?

Since the ability to pay is always a factor in public sector labor disputes, this will produce the best result possible.

FORBES: Leadership