例句與造句

1. Parse trees and / or derivation trees are encountered in the study of phrase structure grammars such as context-free grammars or linear grammars.
2. For example, the language of even-length palindromes on the alphabet of 0 and 1 has the linear grammar S ?! 0S0 | 1S1 | ?.
3. It's difficult to find linear grammar in a sentence. 用linear grammar造句挺難的