This circulation gets moreor less switched off at night when the temperature gradients disappear or reverse, avoiding heat loss and keeping the nest at a roughly constant temperature.

夜间当温度变化消失或是与白天截然相反时，巢内空气循环减弱，有效避免热流失，使得巢穴室温保持稳定。

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But unless we reverse the steady increase in greenhouse-gas emissions, over the long term, the world's temperature is going in one direction: up.

但是我们只要不能停止不断增加的温室气体排放，长期以后，世界在这地区的温度一定会下降。

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As the temperature falls, the reverse happens.

当温度降低时，相反的反应就会发生。

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