Only if the price of electricity were to triple would the amount of electricity used to generate light start to fall by 2030.
只有电价增至三倍，用于照明的总耗电量到2030年才会开始下降。
Only if the price of electricity were to triple would the amount of electricity used to generate light start to fall by 2030.
只有电价增至三倍，用于照明的总耗电量到2030年才会开始下降。
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