1
at random
固定短语，random 作名词，意为“随机地”。
The samples were selected at random.
样品是被随机挑选的。
随机；偶然
randoms — plural of random
先理解核心含义，再看它在真实句子里的用法。
随机；偶然
A roving motion or course without definite direction; lack of rule or method; chance.
The samples were selected at random.
样品是被随机挑选的。
A roving motion; course without definite direction; lack of rule or method; chance.
The direction of a rake-vein.
The numbers were selected at random.
这些数字是随机选择的。
They picked a winner at random from the entries.
他们从参赛作品中随机抽取了一位获胜者。
The samples were taken at random from the population.
样本是从总体中随机抽取的。
固定短语，random 作名词，意为“随机地”。
The samples were selected at random.
样品是被随机挑选的。
非正式用法，random 作可数名词，指“陌生人”或“随意的事物”。
Don't trust a random you meet on the street.
不要相信你在街上遇到的随便一个人。
Not this
Click the button to select a winner random.
Use this
Click the button to select a winner at random.
中文学习者常受副词‘randomly’不足的影响，将形容词‘random’误用作副词。‘at random’是固定短语，意为‘随机地’，应使用此短语或副词‘randomly’。
Not this
The numbers were chosen in random.
Use this
The numbers were chosen at random.
‘in random’不符合英语介词搭配，正确固定短语是‘at random’，表示‘随机地’。介词‘at’在短语中表示‘按照某种方式’。
Choose the next layer that will help you use randoms with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use randoms naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from AI_FALLBACK, ECDICT, WIKTIONARY, WORDNET.