at random

基本解释

The two groups are chosen at random, so the remedy should be the only systematic difference between them.
这两个组是随机抽取的，所以他们在系统中的唯一区别就在是否接受治疗。
He looked around as the glooming evening spread from shadow to shadow; streetlights were flickering on at random, doorways and corners beginning to look threatening.
他四面看看，这时阴暗的黄昏从阴影蔓延到阴影；街灯胡乱地忽明忽暗，门口和街角开始看起来危险重重。
Valid selection policies include selecting the first service in the list, selecting a service at random from the list, or user some user-defined algorithm.
合法的选择策略包括选择列表中的第一个服务、从列表中随机选择服务或使用一些用户定义的算法。

They found that forty-one percent of the profiles chosen at random included information about alcohol or drug use.
The better way to think about this is, suppose, rather than starting at the beginning, I just grabbed some spot at random, like this one.
不从数组的头开始遍历，我随即的从数组中抓一个元素，比如这个，我去看看这个元素的值。
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This is what he says about them about three quarters of the way down the page: During my lunch hour, which I spent on a bench in a nearby park, the waitresses would come and sit beside me talking at random, laughing, joking, smoking cigarettes.
理查在文中,是这样说的：,“我坐在附近公园的长椅上吃午餐，那些女服务生,会坐过来和我谈笑风生。
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Ten winners were chosen at random from all of the entries using a random number generator.
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