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为了本质上研究其中的相稳定性问题，需要制备缺陷少的、杂质少的块体纳米材料。
So in order to study the intrinsic mechanism of phase stability in nano-grained materials, the samples with fewer defects and impurities are required.
块体纳米材料是纳米材料的重要组成部分，制备块体纳米材料是实现纳米材料大范围应用的关键。
Bulk nanometer material is an important part of nanometer material, and a key to wide use for the nanometer material.
块体纳米材料是纳米材料的重要组成部分，制备块体纳米材料是实现纳米材料大范围应用的关键。
Undercooling production technology of bulk nanometer material was introduced, questions to be solved to preparing bulk nanometer materials were pointed out in this paper.
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