correctors and safety systems

例句：

1. 1. The teacher uses a corrector to help students pronounce their words correctly.
   老师使用一个校正器帮助学生正确地发音。
2. 2. The corrector is designed to improve the accuracy of spelling and grammar.
   这个校正器旨在提高拼写和语法的准确性。
3. 3. The student used the corrector to correct his mistakes in the test.
   这个学生使用了校正器来纠正他在测试中的错误。
4. 1. The new building has several safety systems installed to ensure the safety of all employees.
   这座新建筑安装了几种安全系统，以确保所有员工的安全。
5. 2. The company has implemented several safety systems to prevent accidents during production.
   该公司已经实施了几种安全系统，以防止生产过程中的事故。
6. 3. The safety systems are designed to detect and prevent potential hazards before they occur.
   这些安全系统旨在在潜在危险发生之前检测并预防它们。