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
Right.
好。
Time tries truth.
时间考验真理。
Macaroni has been grown in this area for over six hundred years.
通心粉在这个地区已经种植了600多年了。