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 must've come home very late.
一定很晚才回家。
They describe how each process goes on to the next.
表述着每道工艺间的衔接情况。
Hello, I'm Bill. What's your name?
你好，我叫比尔。你叫什么名字？