I want to expand my horizons.

    我想展我的視野。

    I've made a tough decision， sir. Here is my resignation.

    長官，我做了一個很困難的決定。這是我的辭呈。

    I quit because I don't want to be stuck in a rut. I want to move on.

    我不想陷入窠臼所以才辭職。我希望能向前邁進。

    First of all， I'd like to say that I've really enjoyed working with
you. However， I think it's about time for me to leave.

    首先，我要說的是，我真的很高興能與你共事。但是，我覺得該是我離開的
時候了。

    I've been trying， but I don't think I'm up to this job.

    我一直很努力，但我覺得無法勝任這個工作。

    I've been here for too long. I want to change my environment.

    我在這里待太久了。我想轉換一下環境。

    I'm sorry to bring up my resignation at this moment ， but I've decided
to study abroad.

    我很抱歉在這個時候提出辭呈，但我已經決定要出國念書了。

    To be honest， I've got a better offer.

    老實說，我有一個更好的工作機會。

    I'm running out of steam. I need to take a break.

    我精疲力竭了。我需要好好休息。

    I'm quitting because I want to try something different.

    我辭職是因為我想嘗試不一樣的東西。