proof from necessity and possibility

例句：

1. 1. The scientist provided several pieces of proof to support his theory.
   科学家提供了几份证据来支持他的理论。
2. 2. The lawyer presented several pieces of proof to prove the defendant's innocence.
   律师出示了几份证据以证明被告的清白。
3. 3. The teacher asked the students to provide proof for their answers.
   老师要求学生们提供证据来证明他们的答案。