Haa
abbr. 重型防空武器（Heavy Anti-Aircraft）
🗣️ 情景例句
Mr Wang, I'd like you to meet my brother, Haitian.
王先生，我想请你见见我弟弟，海天。
Sorry, sir. But it's our graduation day.
对不起，不过，今天是毕业的日子嘛。
Knowledge began to increase as soon as the thoughts of one individual could be communicated to another by means of speech.
人一旦能用语言同别人交流思想，知识的积累便开始了。