1、Add sufficient cold water once and for all to stew fish, or else it will dilute its freshness.
用冷水燉魚無腥味，并應一次加足水，若中途再加水，會沖淡原汁的鮮味。

2、This was payback time. I've proved once and for all I can become champion.
這是回報之時。我已經(jīng)一勞永逸地證明我能成為冠軍。

3、This new paper puts to bed once and for all the issue of how the Komodo dragon kills, Shaw says.
Shaw認為這一勞永逸地解決了科莫多龍如何殺死獵物的問題。

once and for all翻譯