In many parts of the world renewable energy is already a principal energy source.
在世界许多地方，可再生能源已经是一种主要的能源来源。
Wind is a clean source of renewable energy that produces no air or water pollution.
风是一种清洁的可再生能源，不产生空气和水污染。
Therefore, use of water source heat pump is clean and renewable energy as a technology.
所以说，水源热泵利用的是清洁的可再生能源的一种技术。
Hydropower is the world's largest source of renewable energy.
水电是世界上最大的可再生能源。
Hydropower is a clean, renewable, and environmentally friendly source of energy.
水电是一种清洁、可再生，且对环境友好的能源。
Hydropower is a clean, renewable, and environmentally friendly source of energy.
水电是一种清洁、可再生，且对环境友好的能源。
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