random digit

例句：

1. 1. The results were random and unpredictable.
   结果随机且不可预测。
2. 2. He decided to take a random route home from work.
   他决定下班后随机选择一条回家的路。
3. 3. She randomly picked up the phone and called her friend.
   她随意拿起电话给朋友打了个电话。