... category of paired relationship (名词的)成对范畴 category of ring 环的范畴 category of sets 集的范畴 ...
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category of ring
环的种类
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mechanical method is a category of measuring residual stress. In the category, hole-drilling method, ring-core method and dissecting method are commonly used.
机械法是测残余应力的一类方法，其中常用的有盲孔法、环芯法和剖分法。
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Howard Shore won the Oscar for this category in 2001 for The Lord of the Rings: The Fellowship of the Ring.
NPR: Listening to the Academy Awards: Part Two
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