at random

副词 at random:

1. in a random manner
   同义词：randomly, indiscriminately, haphazardly, willy-nilly, arbitrarily, every which way

1. Chose a card at random from the deck.
   从一副牌中任意选出一张
2. The librarian took a book at random from the shelf.
   图书管理员从书架上随便拿了一本书。
3. By mere chance or fortune; at random.
   碰巧; 胡乱地; 随意地
4. Soiled dishes were piled at random.
   脏碟子胡乱地堆放着。