" So have all of us, at one time and another, " observed Poirot philosophically.

“我们所有人都曾如此，一次又一次，”波洛富有哲理地评论道。

You seem to think one thing at one time, and another at another.

你好像一次想一套， 又想一套。

" Down here on business" ? he asked me. " We get quite a few commercial gents at one time and another. We always like to do what we can for them" .

" 到这儿来有公事？" 他问我说。 " 我们常常接待一些做买卖的先生。 我们总乐意尽力为他们效劳。"

Mr. Carey had so many books that he did not know them, and as he read little he forgot the odd lots he had bought at one time and another because they were cheap.

凯里先生的书太多了，以至于他都不认识它们，而且由于读得很少，他忘记了他一次又一次购买的零星书籍，因为它们很便宜。