Hayley教口语，“随机的”用英语怎么说？

random

adj.

happening, done, or chosen by chance rather than according to a plan

任意的;随机的;胡乱的

random checks/tests/attacks

随机检查/随机测试/胡乱攻击

at random

The winning entry will be the first correct answer drawn at random.

从所有给出正确答案的参赛者中，随意抽出的第一个将获得大奖。

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