Hh
abbr. 倍硬（指铅笔心硬度 double- hard）；半硬的（Half Hard）；重氢, 氚（Heavy Hydrogen）；高功率不定向无线电归航信标（High-powered, non-directional radio homing beacon）；殿下（His Highness）；陛下（His Holiness）；阁下, 先生（His Honour）
📖 牛津释义
HH
abbr 缩写 =
1 His/Her Highness 殿下（用於他称）
HH the Prince/Princess of Wales 威尔斯亲王[王妃]殿下.
2 His Holiness 陛下（用於他称）: HH the Pope 教皇陛下.
🗣️ 情景例句
We had a unique experience here.
我们在这里获得了宝贵的经验。
I plan to learn photography.
我打算学摄影。
When one seriously studies the social orders that have had the opportunity to develop autonomously,
当一个人认真地研究自发形成的社会秩序时，