"小学的电影" 可以用英语翻译为 "elementary school movie" 或者 "primary school movie"。这个词的来源可以追溯到英语中的两个单词 "elementary" 和 "school"。

"Elementary" 指的是基础的、初级的，在英美英语中常用来指小学阶段的教育。例如：

I attended elementary school from kindergarten to grade 5. (我从幼儿园到五年级都是在小学上学的。)
The elementary school curriculum includes math, science, and language arts. (小学的课程包括数学、科学和语文。)

"School" 指的是学校，在英美英语中指从小学到高中的教育机构。例如：

I go to school from Monday to Friday. (我周一到周五都要上学。)
School starts at 8:00 a.m. and ends at 3:00 p.m. (学校从早上 8 点开始，下午 3 点结束。)

所以，"elementary school movie" 就是指针对小学阶段的电影，例如：

The elementary school movie club meets every Friday after school. (小学电影俱乐部每周五放学后开会。)
The elementary school movie night was a huge success. (小学电影之夜非常成功。)