Norad
abbr. 北美防空联合司令部（North American Air Defense Command）
🗣️ 情景例句
I was quite surprised when I read in your letter that you had decided not to finish your studies at the university.
当我在你的信中看到你已决定终止大学学业时感到很是惊讶。
He is studying the ecology of ameba.
他在研究阿米巴
He has tasted the sweets and bitters of life.
他已尝遍了人生的甜酸苦辣。