random slate

例句：

1. 1.The teacher used a random slate to explain the math problem.
   老师用一块随机石板来解释数学问题。
2. 2.The student used a random slate to write down their notes.
   学生用一块随机石板来写下他们的笔记。
3. 3. The artist used a random slate to create a unique painting.
   艺术家用一块随机石板创作了一幅独特的画作。