The quest for finding alternateenergysources has been hastened in Japan in the wake of the Fukushima nuclear power station crisis sparked by the tsunami in March.
自从3月日本海啸引发福岛核危机以来，日本就加快了寻找替代核能能源的步伐。
2
No one is sure just how many Americans live off the national public-utilities grid - relying on generators or alternateenergysources such as solar, wind and geothermal.
没人知道究竟有多少美国人靠国家公共事业的网络生活—依靠发电机或替代能源，如太阳能、风能和地热能。
3
Nuclear and solar energy are two alternatesources, and neither of them is limited.