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
I enjoyed every minute of the party.
这个聚会的每一分钟我都很快乐。
Well, I think it's time we get back to business.
哦，我认为我们该回到正题上了。
it would take about 700 years for half of us to die,
那么我们当中的一半人过700年才会死去，