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
Are you sure you are dialing the right number?
你确定你打的号码是对的吗？
Deep rivers move in silence, shallow brooks are noisy.
深水静静流，浅溪潺潺流。
No, I insist.
不，还是我来。