for more specialized work 为更专门的工作 for prospects of promotion 为晋升的前途
　for higher responsibility 为更高层次的工作

for wider experience 为扩大工作经验

due to close-down of company 由于公司倒闭 due to expiry of employment 由于雇用期满

sought a better job 找到了更好的工作 to seek a better job 找一份更好的工作