The Second Middle School Attached to Beijing Normal University is a well-known school. The motto of this school is "faithfulness, knowledge, simplicity and elegance". The explanation of the proofreader's motto is (1) First, it reflects the mission and historical tradition of a school and reflects its cultural pursuit and spiritual outlook; Second, after years of development, the school motto has become a part of the school culture, deeply affecting generations of students.

(2) "omitted" (answer according to the actual situation)

(3) "omitted" (answer according to the actual situation)