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