求翻译：为此目的，人们相继研究和发展了一系列的淬火介质，以适应机械工业发展的需要，其中目前使用较多的仍是淬火油。虽然有不少关于聚合物淬火介质能完全取代油的说法，但实际上由于油独具的某些特性和在特定条件下的不可替代性，在相当长的一段时间内绝对不可能完全替代。是什么意思？

To this end, the people one after another and develop a series of quenching medium to accommodate the needs of the machinery of industrial development, which use more quenching oil. Although there is a lot to say to the polymer quenching medium can completely replace oil, but in fact due to certain

To that end, it is successively research and develop a series of hardened media, in order to adapt to the needs of industrial development machine, which is currently used is still the more hardened oil. Although there are a lot of polymer quenching media can completely replace oil, but in fact due t

For this goal, the people one after another studied and have developed a series of quenching medium, met the mechanical industrial development need, in which uses at present many was still the quenching oil.Although has many can substitute for the oil completely about the polymer quenching medium th

To that end, people have studied and developed a range of quenching medium in order to meet the needs of machinery industry development, which is currently still using more quenching oil. Although there are many polymer quenching medium can completely replace oil, but actually due under certain cond

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