Osi
[计] 开放式系统互连, 开放式系统互连协议组, 开放式系统互连参考模型
🗣️ 情景例句
Oh! Good afternoon. Mr. Wilson, I'm sorry, but he's not in. He's gone out on business.
哦，您好！威尔逊先生。很抱歉，他不在家，他出差了。
He can't come and he sends his apologies.
他为他的不能前来致歉。
You forget that I was a medical student once upon a time.'
你忘了我以前是学医的了。”