This paper analyses the four main causes leading to the average accidents and puts forward four relevant precaution measures for the sake of enhancing safe management to the fishing boats.
本文从加强渔船安全管理的角度出发，分析产生海损事故的四个主要原因，并提出四项防范措施。
Four measures to prevent tooth decay one, oral health: The main aim is to remove plaque.
四种预防蛀牙的对策一、口腔卫生：主要目的是去除牙菌斑。
Based on a questionnaire survey by factor analysis, four main factors are extracted as effective measures on work attitude.
本文在问卷调查的基础上，采用因子分析法，提取出测度员工工作态度的四个主要因子。
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