checkering machine

例句：

1. 1. The checkerboard machine is used to check the accuracy of printed documents.
   棋盘式机器用于检查印刷文件的准确性。
2. 2. The checkerboard machine was invented by a man named John who wanted to improve the quality of his printing work.
   棋盘式机器是由名叫约翰的人发明的，他想提高他的印刷工作的质量。
3. 3. The checkerboard machine is a useful tool for teachers and students to check their work and correctmistakes.
   棋盘式机器是老师和学生用来检查他们的工作并纠正错误的一种有用的工具。