Similar parts are identified and grouped together to take advantage of their similarity in design and production.
相似的零件被辨识并且群组在一起，利用他们的相似性在设计和生产过程中。
A large of research has shown that the relative age advantage can have a substantial effect on sport achievement when athletes are grouped by age.
大量的研究表明，当运动员以年龄分组时，相对年龄优势对运动员的成材有实质性的影响。
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