在世界许多地方，可再生能源已经是一种主要的能源来源。
In many parts of the world renewable energy is already a principal energy source.
它被认为是一种很有发展前景的绿色能源来源，可用来为沿海地区发电。
It is considered a promising source of green energy to produce electricity in coastal areas.
可靠的能源来源并不足以满足未来的需求。
Reliable sources of energy are inadequate to meet future demand.
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