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1·I saw the letter purely by chance.

我看见这封信纯属偶然。《牛津词典》

2·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。《牛津词典》

3·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。《柯林斯英汉双解大词典》

4·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。《柯林斯英汉双解大词典》

5·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。《柯林斯英汉双解大词典》

6·Why are the chickens crying? By chance?

这些鸡为什么在叫？是偶然的吗？

7·By chance, I met some people who wanted an elephant for their national park in southern India.

我偶然间遇到了一些人，他们想在印度南部的国家公园养一头大象。

8·The site came to light only by chance.

这个地点偶然间才被发现。

9·These products aren't habit-forming by chance.

这些产品并不是偶然形成的。

10·These products aren't habit-forming by chance; it's by design.

这些产品不是偶然使你上瘾的，而是有意设计的。

偶然

1·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。《柯林斯英汉双解大词典》

2·I saw the letter purely by chance.

我看见这封信纯属偶然。《牛津词典》

3·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。《牛津词典》

4·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。《柯林斯英汉双解大词典》

5·To make sure this wasn't by chance, Wang conducted additional tests using different performance measures.

为了确保这不是偶然现象，王使用不同的性能度量进行了额外的测试。

碰巧

1·Tell me, asked the Pigeon, do you by chance know of a Marionette, Pinocchio by name?

“告诉我，”鸽子问，“你碰巧认识一个叫皮诺乔的木偶吗？”

2·By chance, the father of one of Mr Welles's college friends was a prominent orthopaedic surgeon.

碰巧，维利斯先生一个大学同学的父亲是有名的整形外科医生。

3·He met a woman by chance at a party.

他碰巧在一个宴会上遇到了一名女子。

4·Sculpted by stellar winds and radiation, a magnificent interstellar dust cloud by chance has assumed this recognizable shape.

由恒星风和恒星辐射雕塑的壮丽的星际尘埃云，碰巧呈现这易辨认的形状。

5·Class Six won the basketball game by chance.

六班碰巧赢得这次篮球比赛。

偶

1·I do not have the news, can you also think of me by chance.

我没有消息，你会不会偶而也想到我。