Over the past few years, we’ve seen signs that our elementary and secondary school students are doing better.

过去的几年里，我们看到中小学生学的更好了。

Usually we use this expression when talking about elementary and secondary schools – that is to say, grade schools and high schools.

通常我们在谈论小学和中学时使用这个表达 - 也就是说，小学和高中。