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词汇 black-lead
释义 black-lead 英b'lækl'ed美b'lækl'ed BNC²³⁶²¹³⁺¹
基本英英
n.黑铅¹⁰⁰

名词 black lead:
used as a lubricant and as a moderator in nuclear reactors
动词 blacklead:
cover with graphite
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