1. at random : 胡乱地, 随便地；
形容词
名词
1. 任意的；随机的；偶然的
A random sample or method is one in which all the people or things involved have an equal chance of being chosen.
1. lacking any definite plan or order or purpose
governed by or depending on chance
e.g. a random choice
bombs fell at random
random movements