1. (condition_1 AND str_1) AND (condition_1 AND str_2) --> (str_1 OR str_2) AND condition_1
2. (condition_1 AND str_1) OR (condition_2 AND str_1) --> (condition_1 OR condition_2) AND str_1
3. (condition_1 AND str_1) OR (condition_2 AND str_1) --> (condition_1 OR condition_2) AND str_1
4. (condition_1 AND condition_2 AND str_1) AND (condition_1 AND str2) --> ((condition_2 AND str_1) AND str2) AND condition_1
5. (condition_1 AND condition_2 AND str_1) AND ((condition_1 OR condition_2) AND str2) --> 不转换