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英语解释:done, chosen, or occurring without an identifiable pattern, plan, system, or connection

unplanned, without a purpose.
A random selection of things or persons is a selection without pattern. If you pick up people or things as you like without a plan or a pattern, it is picking them up at random. Random sampling is choosing for testing one thing/person and another thing/person there for any study. People are seated at random if their selection has no pattern.