proof plate

例句：

1. 1. The scientist useda proof plate to demonstrate the experiment.
   科学家使用一个证据板来展示实验。
2. 2. Thepolice officer placed a proof plate on thecrime scene to preserve evidence.
   警察在犯罪现场放置了一个证据板以保存证据。
3. 3.The teacher asked the students to use theirproof plates to explain the concept of probability.
   老师要求学生们使用他们的证明板来解释概率的概念。