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
Thank you, thank you!
谢谢 谢谢
No one is answering the phone..
没有人接电话。
Much to the aristocrat's amusement,
贵族感到非常好笑的是