The sun, is also variable over a longterm: its heat output goes up and down in cycles, the latest trend being downward.
太阳在长期内也是变化的:它的热量输出在周期中有上升,也有下降,最近的趋势是下降。
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But the device is still in the early stages of development - current output is around 100kw - and long-term testing is needed to see how it will fare in the harsh ocean environment.