| 单词 | torsion group | 
| 释义 | torsion group [`tȯr·shǝn ´grüp]  MATHEMATICS 1. A group whose elements all have finite period.  2. For a topological space X, one of a sequence of finite groups Gn(X ) such that the homology group Hn(X ) is the direct sum of Gn(X ) and a number of infinite cyclic groups.  | 
	
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