✔ 最佳答案
He will leave office. 離職
He will finish his term of office and is going to leave at the end of this month.
He will retire from office. 退休離職
He will finish his term of office and is going to retire at the end of this month.
都是正常卸任的意思, 另有step down, abdicate 和 renounce都帶有並不正常的卸任, 有下台、放棄、退位的意思, 看你如何描述
outgoing是比較中性的 the outgoing president 即將離職(卸任)的總統