abbr.半宽；半（横）粱(Half Beam)，手册，港务局(Harbor Board)

HB pencil is commonly used for writing and drawing.
HB铅笔常用于写字和绘画。
The blood type of the donor should be compatible with the recipient's, such as Type A to Type AB or Type O to HB.
捐赠者的血型应与接受者的血型相容，例如A型到AB型或O型到HB型。
The hardness of an HB graphite stick ranges between that of a 2B and a H stick.
HB石墨条的硬度介于2B和H之间。
The HB virus can cause chronic hepatitis in humans.
HB病毒可引起人类慢性肝炎。
She uses an HB brush pen for calligraphy practice.
她用一支HB毛笔练习书法。
In the new school year, my son needed a set of HB pencils for his art class.
新学年里，我儿子的艺术课需要一套HB铅笔。
HB wood-cased pencils have a distinctive smell that reminds me of childhood.
HB木制铅笔有一种特有的气味，让我想起童年时光。
The footballer was suspended for one match due to receiving a yellow card (HB) in the previous game.
那位足球运动员因为在上一场比赛中得到一张黄牌（HB），被禁赛一场。
The company's HB series of products offer excellent durability and performance.
该公司HB系列的产品具有极好的耐用性和性能。
My doctor recommended I get vaccinated against HBV to prevent liver disease.
我的医生建议我接种乙肝疫苗以预防肝脏疾病。