词汇	proper period
释义	proper period 固有周期
随便看	student moral student moral education student mortality student motivation student movement student-name student-names Student National Coordinating Committee Student National Medical Association student naval aviator student naval flight officer student nearsightedness student needs student network student networks student-newman-keuls student news organizations Student Nonviolent Coordinating Committee student railpass Student Rating of Teaching student ratings student rating scale student number student numbers Student numbers have been dropping of recently