单词	study of documents
释义	study of documents 文献学
随便看	secondary halo measurement secondary halo of drainage system secondary handling secondary hardeness secondary hardening secondary-hardening secondary hardness secondary harmonic secondary harmonical secondary harmonic brake secondary harmonic exciting efficiency secondary harmonic generation secondary-harmonic restraint secondary harmonics secondary harmony secondary haulage secondary hauling secondary haustorium secondary hazards secondary head exchanger secondary heads associations secondary healing Secondary health and vocational education secondary healthcare secondary health care