虽然以11年为周期的太阳黑子活动将在2013年达到顶峰之后，将缓慢衰落。
Sunspot activity, which follows an 11-year cycle, is due to peak in 2013 after which it will start to wane slightly.
领导权力的上升、持续、衰落有一定的规律，即领导权力生命周期曲线是一条不规则抛物线。
The ascension, continuity and decline of leadership power follow certain rule. That is to say the life curve of leadership power is an irregular parabola.
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