If the sun's energy output is changing, then its temperature must be fluctuating too.
如果太阳输出的能量在变化那么其温度必定也在波动之中。
And as it turns out, the biggest factor affecting prehistoric temperature shifts has been fluctuating levels of carbon dioxide in the air.
而结果是，影响史前气温转变的最大因素一直是空气中二氧化碳含量的摆动。
In spring the air temperature rises in a fluctuating way and mulberry grows by stages.
春季气温呈波状形上升，桑树生长也表现为阶段累积生长。
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