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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Each time I kept him away from us by giving him a sunny smile or a little wave, as if to assure him we were in a good state.

每次让他离开时我都给他一个灿烂的微笑或一个小小的挥手，好像是为了让他相信我们正处于一个很好的状态。

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It is really a pleasant time to have a picnic on a warm sunny day.

在温暖晴朗的日子里野餐真是一段愉快的时光。

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In many sunny places, including several American states and southern European countries, it is cheaper than the peak-time retail price of electricity.

ECONOMIST: Solar power