accidental
单词辨析：
指无计划或目的地选择或发生的。
a random sample of 100 families
随机抽样的100个家庭
The survey was conducted based on a random selection of women who were in the shop.
在店内随机选择了一些女性进行了调查。
指计划外或无意间发生的。
In fact, their meeting was not accidental.
事实上，他们的相遇并不是偶然的。
The company lost its advantages due to an accidental leak of its designs.
由于设计方案意外泄漏，该公司失去了优势。
指随意、并无计划的，只作定语。
She first heard of his name in a casual conversation.
她在一次偶然的谈话中第一次听到他的名字。
The professor made some casual remarks about his paper.
教授对他的论文随口点评了几句。
相关例句：
The mayor of Lhasa says the incident was not isolated or accidental.
拉萨市长说，这起事件绝不是孤立和偶然的。
It was an accidental meeting.
这完全是一次偶然的会见。
He can face the accidental trouble.
他能够面对意外的困难。
An emergency preplan for accidental pollution was described so as to provide reference for cleaning production.
对如何防止和降低可能突发性污染所做的应急预案进行了阐述，为保证清洁生产提供参考。
The rash of accidental shootings underscores how difficult it will be to restore order here.
一连串的意外枪击事件凸显了恢复该地区的秩序有多困难。
Male probabilities of accidental or violent deaths are elevated to an astonishing degree.
意外事故或暴力事件死亡的男性概率提升到了一个惊人的程度。