然而，作为一个实际问题，这种外国批评并没有多大关系。
As a practical matter, however, this foreign criticism doesn't matter much.
受热面污染作为燃煤电站锅炉运行中一个不可避免的实际问题，对锅炉的安全经济运行带来严重影响。
Slagging and fouling on heat transfer surface is a familiar and unavoidable problem of power boiler, which is adverse to keep boiler running safely and economically.
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