围绕着换脸有相当多的争论，一部分原因是因为面部的损伤并不是致命的危险。
Some controversy has surrounded the issue of face transplants, in part because face injuries are not seen as life-threatening.
回转式空气预热器是高参数大容量电站锅炉广泛采用的尾部换热设备，漏风率高是该类设备的致命缺点。
The rotary air preheater, which is the widely used tail-end heat exchanging equipment in large capacity boilers with high parameters, has the fatal defect of a high air leakage rating.
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