例句與造句

1. The class field tower problem asks whether this tower is always finite; attributed this question to Furtwangler, though Furtwangler said he had heard it from Schreier.
2. In class field theory, the "'class field tower "'of a number field " K " is created by iterating the Hilbert class field construction.
3. It's difficult to find class field tower in a sentence. 用class field tower造句挺難的