The program that we're doing right now is outdoor fitness classes.

我们现在正在做的项目是户外健身课。

In one outdoor class, a teacher took his pupils through some English grammar.

在一堂户外课上，一位老师教他的学生一些英语语法。

You heard right, not pre, but tree-schoolers who attend outdoor classes to learn about ecology and sustainability at an early age by getting their little hands dirty.

你没听错，他们不是学前儿童，而是参加户外课程的树木学生，他们在很小的时候就亲手实践，了解生态学和可持续性发展。