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词汇 FR
释义 FR ˈfɑːðər COCA¹⁷⁵¹⁹BNC¹⁶⁹⁰¹Economist⁵³⁵⁸¹⁺¹
基本英英近义反义
abbr.故障率=failure rateabbr.故障记录=faillure recordabbr.故障报告=failure report

Noun:
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium近义词 francium化钫
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