America cannot continue to sustain it at current levels.
美国不可能以目前的水平维持下去。
At current levels, the IEA calculates, nuclear power is cheaper than gas and almost as cheap as coal.
国际能源组织计算,按目前水平,核能比天然气更廉价,比煤炭更清洁。
It also said it would maintain its mortgage-related holdings at current levels to support the housing market.
它还表示会维持当前抵押贷款的利率来支持房地产市场。
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