Dear XXX,
Please accept my resignation. I plan to leave my job here on xxx(具体时间)
As you know, the reason is mainly i can't adapt to more and more tasks within too much pressure,and working overtime .
You and the organization as a whole have treated me very well over the past xx(任职几年)years. I won’t forget the friendship and professional growth I’ve experienced as an employee here.
Best wishes to all of you for years of expansion here.
Sincerely,