能源价格一直维持低水平，所以能源利用效率很低。
Energy prices have been kept low, so energy is used inefficiently.
换热器性能的好坏，直接影响着能源利用和转换的效率。
Their performances are directly connected with the effective using and transferring of energy.
换热器性能的好坏，直接影响着能源利用和转换的效率。
Their performances are directly connected with the effective using and transferring of energy.
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