和田河流域地表径流变化分析-中科院文献信息中心 关键词：地表径流；和田河流域；变动周期；干旱地区 [gap=973]Key words：surface water runof；the Hotan River Basin；period of variance；arid area
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简言之，相对的和平稳定与战争动乱，呈周期性波动，是这个500年期间一个全球性的现象，这似乎与气温变动周期相关联。
In short, synchronous periods of relative peace and turbulence during those 500 years were a global phenomenon seemingly linked to temperature change.
因此房价的变动使经济周期恶化。
睡眠专家也指出人昼夜周期中，即使是很小的变动，也会随着周期的不断推移而扩大。
Also, sleep scientists know that even a small variation in people's circadian cycles gets amplified by such factors as when in their cycle light strikes the eye.
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