Though he said all this in his frivolous way, the way seemed, for that once, a conscious polishing of but an ugly surface.

尽管他用轻浮的方式说了这一切， 但就那一次而言， 这种方式似乎是有意识地抛光丑陋的表面。

In all my travels I have never, but for that once, been required by the British customs to open a single bag or to do more than state that I carried no goods liable to duty.

在我所有的旅行中，除了那一次，英国海关从未要求我打开一个袋子，或者除了声明我没有携带任何应纳税的物品外，我还需要做更多的事情。