He had met Mr. Maude by chance.

他偶然遇到了毛德先生

I saw the letter purely by chance.

我看见这封信纯属偶然。

Several years after they'd split up they met again by chance in Paris.

他们分手几年以后在巴黎又偶然相遇。

In this house nothing is there by chance: it is always the result of great deliberation.

在这房子里，没有什么东西是偶然的——总是非常仔细考虑后的结果。

I came here by chance and was just watching what was going on, when this girl came up to me.

我碰巧来到这里，正在看热闹，这时一个女孩向我走来。

Danielle was among the last to find out, and as often happens, too, she learned of it only by chance.

丹妮尔是最后一个才知道的人之一，而且同往常一样，她也只是偶然听到的。