In addition to the internal variabilityof 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。
2
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。
3
As a social phenomenon, the style of language has only the stability, but the variability and the artificial factor is quite clear.