例句與造句

1. Big line bundles need not determine birational isomorphisms of " X " with its image.
2. So to classify all compact complex surfaces up to birational isomorphism it is ( more or less ) enough to classify the minimal non-singular ones.
3. For example, if " C " is a hyperelliptic curve ( such as a curve of genus two ), then its canonical bundle is big, but the rational map it determines is not a birational isomorphism.
4. It's difficult to find birational isomorphism in a sentence. 用birational isomorphism造句挺難的