【案例】许某与某企业签订了五年期的劳动合同,在合同履行的第二年,由企业出资送许某进行专业培训,双方签订了培训合同,约定培训结束后许某在该企业工作不得少于三年,否则应退赔企业为其支付的培训费用。培训结束后,许某在该企业工作不到一年便不辞而别,企业多次找到许某,要其回单位上班,履行合同,但许某一直没有回该企业上班,无奈,该企业决定将许某除 [Case] ​​Xu and a business signed a five-year labor contract, the contract for the second year, funded by the enterprise to send Xu to conduct professional training, the two sides signed a training contract, Xu agreed after the training of the enterprise Work should not be less than three years, or should pay the enterprise for their training costs. After the training, Xu in the company less than a year to work without leaving one after another, many companies find Xu, to return to work units to fulfill the contract, but Xu has not returned to the business to work, helpless, the company decided to be Something except