Hello,。
    I'm writing to let you know that I'll need to take a day off from work. I've been feeling a bit under the weather lately and think a day of rest would do me some good.
    I'm sorry for the inconvenience, but I believe it's important to take care of myself so that I can be at my best when I return. I've already arranged for my tasks to be covered during my absence.请假单格式
    I hope to be back feeling refreshed and ready to tackle whatever comes next. Thank you for understanding and for all your support.
    Looking forward to being back in the office soon. Take care!