随机 (suí jī): 상황에 따라.

The teacher didn't call on students in the order of the roster; instead, she randomly picked a few classmates to answer questions.

The supermarket is holding a lucky draw; customers can randomly receive a discount coupon.

To be fair, the groups for the competition are decided randomly; you can't choose your own opponent.

This app randomly recommends some articles you might be interested in; every time you refresh, they're different.

The researchers randomly selected one hundred volunteers to participate in the experiment to ensure the reliability of the results.