by chance基本解释
偶然地，意外地；无意之中；碰巧；偏巧

网络释义
1. 偶然,碰巧
2. 偶然地,意外地
3. 偶然,意外地
4. 随机
5. 恰巧
6. 巧合
7. 或许
8. 可能

Mr. soong didn 't become so influential by chance .
宋先生变得这么有影响力并不是偶然的。
Talked to a stranger you meet by chance in the wood .
对一个你在树林中偶然遇到的陌生人说话。
I ran into her by chance one night and got her e-mail address .
在一次偶然的晚上我碰见了她而且得到了她的电子邮箱。
When simple amino acids were formed by chance environmental forces would tend to destroy incipient order .
当简单氨基酸偶然形成的时候，环境的力量很容易毁灭这种最初的秩序。
A divorcee ms. bali says that her affair with the politician began after the two met by chance at a juice stall in 2004 .
此前离过一次婚的巴厘女士表示，她是在2004年在一个果汁摊前偶然遇到穆罕先生的。