A distinction should be made between the primary and secondary tasks.

要区别主要的和次要的任务。

《新英汉大辞典》

youdao

youdao

"The president has called for focusing in on what it really takes to be successful in work and in college, and he has called on America's educational institutions, primary and secondary educational institutions, to do whatever it takes to get our kids college ready.

VOA: special.2010.02.25

Actually there are two discount rates; there's primary and secondary.

事实上，这里有两个贴现率；,一级贴现率和二级贴现率。

耶鲁公开课 - 金融市场课程节选

This is an unfortunate thing you see throughout education frankly, certainly at the secondary and primary school level where you just insert technology into the classroom and expect to solve problems, that is not in life always the case.

遗憾的是,中小学教育中,就是讲知识然后运用所学的知识解决问题,但是实际生活中不总是这样。

哈佛公开课 - 计算机科学课程节选

According to the poll, of primary and secondary school staff, dissatisfaction increased with experience.

BBC: Staff have complained about pay and tests

The competition attracted over 13, 000 entrants from primary and secondary schools from around the world.

BBC: Soldier Number 2

He already runs primary and secondary schools, and a small hospital, which he says are profitable.

ECONOMIST: Businessmen are starting to challenge the authorities