beads - 珠子, energy - 活力, natural - 自然的, pollution - 污染, produce - 生产, renewable - 可再生, replace - 代替, sources - 来源, traditional - 传统的, solar system - 太阳系, solar power - 太阳能, fossil fuel - 化石燃料, rough - 粗糙的, an alternative - 替代, polish - 抛光, to value - 重视,

G3 Unit 5 Week 5 - Here Comes Solar Power

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