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
Philip needs a day off. Philip
需要休假。
No. It only goes as far as Main Street, but you can get the Number 31 there.
不去，最远只到正街。不过你可以到那里再乘31路。
He's already a little weak in Chinese.
他的中文已经有点儿弱了。