例句與造句

1. Classical descriptive set theory includes the study of regularity properties of Borel sets.
2. In particular, it focuses on lightface analogues of hierarchies of classical descriptive set theory.
3. In many cases, results of classical descriptive set theory have effective versions; in some cases, new results are obtained by proving the effective version first and then extending ( " relativizing " ) it to make it more broadly applicable.
4. It's difficult to find classical descriptive set theory in a sentence. 用classical descriptive set theory造句挺難的