once and for all 一勞永逸、一次過（解決某問題）
說明：
once and for all 當副詞用。and 也可以省略而寫成 once for all。
例子：
We have decided to settle the bank loan once and for all.
by Thomas Shum
once and for all 當副詞用。and 也可以省略而寫成 once for all。
We have decided to settle the bank loan once and for all.
by Thomas Shum