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- To occur by chance; happen. 偶然发生；碰巧
- To take place or occur by chance. 偶然发生或出现
- Occurring by chance; fortuitous. 侥幸的碰巧发生的，幸运的
- Contamination of hands with nickel was shown to occur by handling cupro-nickel coins for five minutes, the study said. 人们的手和这种镍铜合金硬币保持5分钟接触就会引起镍污染。
- Baloney, said some U.S. statisticians, who suspected the finding was simply a false association that can occur by chance in a large set of data. 美国的一些统计学家认为这是一派胡言，他们怀疑这个结论只是一大堆统计数据中偶然出现的错误关联。
- Happen,occur,or be the case in the course of events or by chance. 碰巧发生发现或正好在事情的进程中存在。
- She tried to commit suicide, but we saved her life by chance. 她试图自杀，但我们碰巧救了她。
- No one discovers a rarity by chance. 侥幸发现一件珍品的人是没有的。
- It is unthinkable that we shall allow a nuclear holocaust to occur. 我们若竟让核武器大屠杀的惨剧发生，简直是匪夷所思。
- We tossed a coin (eg to decide sth by chance) and it came down heads. 我们把硬币一掷(如以此法决定某事), 落下後是漫面朝上。
- Liable to occur but not with certainty; possible. 可能的可能但又有不确定性的; 可能的
- He had a slip of tongue by chance. 他偶然说走嘴。
- The apple fell by chance on his head. 那个苹果意外地落到他的头上。
- It's unlikely to occur by swallowing a pill or donning(1) a special cloak(2), but invisibility could be possible in the not too distant future, according to research published on Monday. 周一发布的一项研究说隐身也许能在不久的将来实现，但也许不是吞下一片药或者披上一件斗蓬那样简单。
- We met (each other) quite by chance. 我们(彼此)相遇纯属偶然。
- Despite the uncertainty it brings to workers lives, the company must look out for its own best interests first and not allow this disastrous situation to occur by not instituting a tenure policy. 尽管会给工人的生涯带来不肯定因素，公司还是应当把寻求自身的最大好处放在首位，通过不设立终身职位政策来阻止以上提及的灾难性格况的产生。
- The news came to my ears by chance. 我是偶然听到这个消息的。
- We hadn't planned to meet. We met by chance. 我们本没打算见面。我们是碰巧遇见了。
- I don't want such a thing to occur again. 我不希望再发生这样的事情。
- Occurring by chance;fortuitous. 侥幸的碰巧发生的，幸运的
