Cyclic changes in hormones. Signs and symptoms of premenstrual syndrome change with hormonal fluctuations and disappear with pregnancy and menopause.
激素周期变化。经前综合症的体征和症状随着激素的变化而发生变化，而在妊娠期和更年期的时候会消失。
And it's an extremely short segment within an eternally long natural cyclic pattern of change that continues to occur independent of our presence or approval.
另外，在一个永恒长的自然循环变化模式中，这只是一个极其短暂的阶段，无论我们在不在或同意与否，今后依然会出现。
Other environmental pressures to the reef and its ecosystem include water quality from runoff, climate change accompanied by mass coral bleaching, and cyclic outbreaks of the crown-of-thorns starfish.
其他对于大堡礁及其生态系统的环境压力来自径流的水质问题，伴随着大规模珊瑚白化的气候变化以及棘冠海星的周期性爆发现象。
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