The payback period for buying a basic solar lantern over a kerosene lantern will fall from seven months today to below two months in 2015.
到2015年，买一只简单的太阳能灯相对于一盏煤油灯的回收率，将由现在的7个月减少到2个月。
The payback period for buying a basic solar lantern over a kerosene lantern will fall from seven months today to below two months in 2015.
到2015年，买一只简单的太阳能灯相对于一盏煤油灯的回收率，将由现在的7个月减少到2个月。
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