| 单词 | lustrum | 
| 释义 | lus·trum    (lŭstrəm)n. pl.   lus·trums or   lus·tra (-trə)  1.  A ceremonial purification of the entire ancient Roman population after the census every five years. 2.  A period of five years. [Latin lūstrum; see  LUSTER.]  | 
	
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