We can't see the sun at night.
我们在夜里看不到太阳。
There is no reflected energy available from the sun at night.
没有反映能量可以从太阳在晚上。
Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.
这两种装置在阳光充足的气候条件下工作良好;但在北欧,太阳可能一次被云层遮挡数周,而温度不仅随着季节变化,而且还随着昼夜变化。
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