不同意楼上的说法, at random并不非得是计算机术语,如: He took a book at random. 他随手取了一本书. 此句应为:He draw a picture at random. He drew a picture at random. He paint a picture at random. He painted a picture at random.
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。 Soiled dishes were piled at random. 脏碟子胡乱地堆放着 You can only receive 1 random referral per day. 每天只能获得一个随机的提名。 随意的 He drew a picture at random