- hard-black: denoting a medium-hard lead
单词 | hb |
释义 | WordReference Random House Unabridged Dictionary of American English © 2024 Hb, Symbol, Biochem.
h.b., [Football.]
Collins Concise English Dictionary © HarperCollins Publishers:: HB symbol for (on Brit pencils)
Collins Concise English Dictionary © HarperCollins Publishers:: Hb symbol for
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