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。
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.
世界上有些地区煤炭和矿产供应充足，土壤肥沃，气候宜人；而其他地区则不具备这些条件。
Some regions of the world are well supplied with coal and minerals, and have a fertile soil and a favourable climate; other regions possess none of them.
我想构建一张很大的网，但我认为，我的书，根据我的想法，不可能，具备必要且充足的条件，以使得其中没有重合之处。
It's all I want it to be a big net, but I don't think that my works, based on my mind, works in such a way that it can have necessary and sufficient conditions so that there will be no overlap.
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