a scrap of evidence的用法和样例：
- He couldn't produce a scrap of evidence against it.
- There's not a scrap of evidence to support his claim.
- There's not a scrap of truth in the claim.
- There is not a scrap of truth in what he says.
- Jimmy does not have a scrap of imagination.
- He wrote his address on a scrap of paper and gave it to me.