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1.The battery's charge is low, so we need to recharge it.
电池的电量很低，所以我们需要给它充电。
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2.The conservation of energy is crucial for the environment.
能源的节约对环境至关重要。
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3.The conservation of natural resources is a pressing issue in today's society.
自然资源的保存是当今社会一个紧迫的问题。