evening gain
问题描述：
evening gain
请解释一下evening gain,并翻译一下这句话.
The researchers found that the practice reduced lighting and electricity consumption in the evening but increased energy use in the now dark mornings—wiping out the evening gains.
答
调查者发现,实际上前半夜的光电输出减少了,但是后半夜的能量消耗反而上升了,相当于把前半夜省出的能量给消耗了.