爲更專門的工作for more specialized work
爲晉升的前途for prospects of promotion
爲更高層次的工作責任for higher responsibility
爲擴大工作經驗for wider experience
找一份更好的工作to seek a better job
由於僱用期滿due to expiry of employment
找到了更好的工作sought a better job
由於公司倒閉due to close-down of company