当白天和黑夜一样长时，春天就开始了。
当白天和黑夜再次等长时，秋天就开始了。
Autumn starts when the day and night are the same length again.
毕竟，当白天执行用电管制时，汽车正在行驶，而晚上用电需求少些时，汽车再充电。
After all, the cars are typically driven during the day, when most of the blackouts are scheduled, and charged at night, when demand is lower.
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