for more specialized work 为更专门的工作for prospects of promotion 为晋升的前途for higher responsibility 为更高层次的工作责任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offered a more challenging opportunity 获得的更有挑战性的工作机会sought a better job 找到了更好的工作to look for a more challenging opportunity 找一个更有挑战性的工作机会to seek a better job 找一份更好的工作