In addition to the internal variability of the globalclimatesystem 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。
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We also know that the globalclimatesystem is immensely complicated and that everything is in some way connected, and so the system is capable of fluctuating in unexpected ways.