Not fixed.

According to the official website of the National Natural Science Foundation of China, we learned that there is no fixed number of times for the National Natural Science Foundation to evaluate associate professors. The evaluation of associate professors needs to comprehensively consider the applicant's academic level, scientific research achievements, academic contributions, etc. factor.

Fund, in English, is fund, which broadly refers to a certain amount of funds established for a certain purpose. It mainly includes provident funds, trust investment funds, insurance funds, retirement funds, and various foundation funds.