纯天然海洋周期性波动极大影响着这些温度的变化，也影响着来自热带的传热模式。
These temperature shifts are heavily influenced by entirely natural ocean cycle fluctuations that affect heat transfer patterns from the tropics.
气温变化周期是根据氧同位素测定的大量远古温度记录而推演出来的。 气温变化周期与人类演化进程的对照，暗示“黄金时期”与气候急剧波动而短暂的时期相对应。
What marked out this period was a greater range of recorded temperatures, suggesting it was a time of rapid but short-lived fluctuations in climate.
由于受热带厄尔尼诺和拉尼娜现象的周期变化，全球温度的年际变化是很大的。
There’s substantial year-to-year variability of global temperature caused by the tropical El Niño-La Niña cycle.
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