一、案情介绍：某机械厂职工张某经过三年的半脱产培训取得大专学历文凭，企业为他报销了全部培训费，双方还根据该企业的规章制度，签订了“补充劳动合同”。按合同的约定，张某在培训结束后至少须为企业服务四年，如提前解除合同，按每提前一年支付25％培训费的标准进行赔偿 First, the merits and demerits of the case: a mechanical factory workers Zhang after three years of half-time training to obtain a college diploma, the company reimbursed all the training fees for him, both sides also under the company’s rules and regulations, signed the “Supplementary Labor Contract.” According to the contract, Zhang at least after the end of training for business services for four years, such as the early termination of the contract, one year in advance to pay 25% of the training fee standards for compensation