In addition to the internal variability of the global climate system itself, there is the added factor of external influences, such as volcanoes and solar activity.
除了全球气候系统本身的内部变化之外，还有外部影响的附加因素，如火山和太阳活动。
Psychologists have found that a substantial factor accounting for this variability is the perceived degree of control that people have over their daily lives.
心理学家们已经发现了能解释这个差异的一个重要因素，那就是人们在日常生活中对控制能力的认知度。
As a social phenomenon, the style of language has only the stability, but the variability and the artificial factor is quite clear.
语言风格作为一种社会现象，既有稳定性又有变异性，而且人为的因素非常明显。
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