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unplanned, without a purpose.
英语解释:done, chosen, or occurring without an identifiable pattern, plan, system, or connection
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.
- The company does random testing of its products to make sure of the quality of the products of any batch. They pick up one bottle of tablets and another there for testing.
- The terrorists opened fire at random killing mostly innocent people. They had no fixed targets to fire at.