Hb
abbr. [军] 厚膛壁身管（Heavy Barrel）
📖 牛津释义
HB
abbr
缩写 = (of lead used in pencils) hard black (ie medium hard) （指铅笔芯）硬黑（即硬度适中）
an HB pencil 一支HB的铅笔. Cf 参看 B, H.
🗣️ 情景例句
Stop flirting with me.
别跟我调情！
Opportunity seldom knocks twice.
机不可失，失不再来。
Yes, there is one.
是的，有一个。