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
You.
你。
A straight foot is not afraid of a crooked shoe.
身正不怕影子斜。
That's OK.We really need the material.
没关系，我们急着要这些原料。