secondary data

例句：

1. 1. The primary goal of the project is to improve efficiency.
   这个项目的主要目标是提高效率。
2. 2. The secondary school students are preparing for their college entrance exams.
   中学生正在为大学入学考试做准备。
3. 3. In a secondary school, students learn mathematics and science from textbooks.
   在中学，学生们通过课本学习数学和科学。