不幸的是，这个早期的工厂遇到了许多可再生能源形态都遇到的问题：韦河的水流不稳定，而水车很快就被蒸汽机取代了。
Unfortunately this early plant experienced the problem common to many forms of renewable energy: the flow in the Wey River was unreliable, and the waterwheel was soon replaced by a steam engine.
这个过程可能周而复始，周期性地重复--天文学家称之为"脉动"对不稳定性超新星--直至恒星失去足够的物质，在普通超新星的形态中走到生命的尽头。
The cycle can repeat itself in pulses—astronomers call this case a “pulsational” pair-instability supernova—until the star loses enough mass to end its life in an ordinary supernova.
自发间盘退变的动物模型主要是间盘形态功能之间不稳定的平衡，遗传因素的影响可以改变这种平衡而加速退变。
Spontaneous model with intervertebral disc degeneration was the balance of unstability in modal function, while the effect of genetic factor could change this balance and accelerate the degeneration.
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