proof machine

例句：

1. 1. The proofer is designed to ensure the accuracy of the text.
   该校样机旨在确保文本的准确性。
2. 2. The checker is used to verify the accuracy of the data.
   该校验器用于验证数据的准确性。
3. 3. The validator is used to ensure the validity of the documents.
   该校验器用于确保文件的有效性。