If you toss a coin twice and the first experiment doesn't influence the second, we say they're independent and there's no relation between the two.

如果你抛两次硬币,第一次的结果并不影响第二次的结果,所以我们说他们是相互独立的,这两次试验没有关系

耶鲁公开课 - 金融市场课程节选

Independent experiments are experiments that occur without relation to each other.

独立试验的概念就意味着每一个试验,和其他试验的结果没有关系

耶鲁公开课 - 金融市场课程节选