Warn of
大学 College警告…,有…危险
🧩 词语组成解析
warn
[wɔrn]
vt. 警告，告诫;通知;预告;
vi. 发出警告;
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
It's John. Didn't you recognize my voice?
我是约翰。你没听出我的声音？
Thank you for inviting me.
谢谢你邀请我。
only of metal, which wears away by friction.
而是由金属组成，而金属可以随着磨擦而磨损殆尽。