⑴ 如何用英语体面的解释离职原因
体面的解释离职原因，说明你和公司是和平分手，那么最好的离职理由就是个人职业发展，本公司（业务范围、组织架构等）已经不能满足你的职业发展规划(虽然你不想离开)，基本上就可以这么说了:
I'd like to pursue new opportunity because of my personal career plan. It will be my best memory for last ( ? 具体看你在此工作几年了) years as (公司名) familiy members. We work together as a team, and help each other to solve the issue, achieve the same goal of success.
But I'd like to take more responsibility in the future, and I hardly see any chance to get it here.... 等等等，再发挥发挥。总之意思就是这里很好，但是已经不适合我了，才符合题主体面的意思。