求翻译：它与周围介质的换热从整体上可以分为两种：第一种是缸盖与冷却水腔内冷却水之间的换热；第二种则是缸盖与缸内的高温燃气、排气道内的高温废气以及进气道内低温新鲜空气之间的热交换。对于这两种换热的热边界，如果都采用实验测量的方法给出，将会十分困难。是什么意思？

Overall heat exchanger with the surrounding medium can be divided into two types: the first is a heat exchanger between the cylinder head with cooling water cavity cooling water; The second is the cylinder head and cylinder of high-temperature gas row airway high-temperature exhaust gas as well as h

It's with the surrounding medium heat exchange on the whole can be divided into two: The first is a cylinder head with the cooling water in the cooling water feed between hot; the first 2 cylinder is a cylinder head cover with the hot exhaust gas, the hot exhaust gases, as well as intake of low-temp

It may divide into two kinds overall with the environmental media heat transfer: The first kind is in the cylinder cover and the cooling water cavity between the cooling water heat transfer; The second kind is in the cylinder cover and in the cylinder high temperature fuel gas, in the exhaust passag

Heat around it and media as a whole can be divided into two types: the first is the heat transfer between the cylinder head and in the cooling water jacket cooling water; the second is the gas in the cylinder head and the cylinder and exhaust in the high temperature and low temperature in the exhaus

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