random multiple access

例句：

1. 1. The random selection of the winners was based on a lottery system.
   获奖者的随机选择是基于抽奖系统。
2. 2. The random walk is a mathematical model that describes the movement of particles in space.
   随机漫步是一种描述空间中粒子运动的数学模型。
3. 3. The randomness of the weather can cause unpredictable outcomes.
   天气的随机性可能导致不可预测的结果。