英语习语：

once and for all 最后一次；干脆；彻底

——I am going to tell that neighbor of mine to turn down that music once and for all.（我要最后一次告诉我那个邻居把音乐声关小。）
——I see why you are angry. But I've always found that the polite route is the most effective. (我明白你为什么恼火。但我总觉得礼貌的方式是最有效的。)

双语例句：
The problem can be solved once and for all, if you do that.
如果你那样做，问题就可能一劳永逸地得到解决。

Why don't you negotiate directly with him and solve this issue once and for all?
您为什么不直接与他进行协商，一劳永逸地解决这个问题？

Perhaps its time to take a closer look at the new Smurfs trailer to decide once and for all ...
也许现在是时候了，让我们仔细看看这部新电影《蓝精灵房车》，彻底地了解下吧。

Tonight Jobs cleared up the matter once and for all.
今晚乔布斯彻底地澄清了这个问题。