Students are shown eight sentences each with a grammar mistake and have to match the mistake with the index word in a grammar book.
学生先看八个句子，每个句子中有一处语法错误，学生必须把这些错误类型与语法书上的索引词相匹配。
2
Besides, the search steps in probabilistic CYK algorithm is reduced and the probabilistic CYK algorithm is improved by rearranging grammar rules of SCNF and establishing the index table.