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
that we can talk about us.
我们就可以谈谈我们。
Theings present are judged by things past.
欲断今日事，须知往日情。
The majority of thepatients attending the medical out-patients departments of our hospitals
在医院门诊部看病的大多数人