Metatheorem
[计] 元定理
🗣️ 情景例句
I'm sorry, I really don't know.
对不起，我真的不知道。
It is lost labour to sow where there is no soil.
没有土壤，播种也是徒劳。
At the moment in my country there are very few such schools.
目前在我国这类学校太少了。