Nature day. According to the relevant public information, the external evaluation of papers is also called blind evaluation, which means that dissertations without the author's name are sent to experts for evaluation, so the score should be the most objective. In order to ensure the normal work of blind examination of dissertations, all master students applying for dissertation defense must submit their dissertations 30 days in advance, and doctoral students should submit their dissertations 45 days in advance (excluding winter and summer vacations).