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1·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》

2·Historians use a wide range of primary and secondary sources for their research.

历史学家在研究中使用大量的原始资料和二手资料。《牛津词典》

3·Can we just backtrack a little bit and look at your primary and secondary education?

我们能否稍微回顾一下刚刚提及的你的中小学教育背景？《柯林斯英汉双解大词典》

4·It's already common practice worldwide to limit students' use of mobile phones in primary and secondary schools.

限制中小学生使用手机已经是全世界的普遍做法。

5·More than six hundred teams took part in the 2017 Nanjing primary and secondary school robot competition in May.

今年5月，超过600支队伍参加了2017年南京市中小学机器人比赛。

6·It is reported that hundreds of schools in China will use the textbooks for primary and secondary school students in 2019.

据报道，2019年，中国数百所学校将在中小学生中使用该教材。

7·China's first set of AI textbooks will come into the classrooms of primary and secondary schools soon in many parts of China.

中国首套人工智能教科书将很快进入中国许多地区的中小学课堂。

8·All primary and secondary school students in China will be banned from bringing mobile phones to school, the Ministry of Education announced in early February.

教育部2月初宣布，将禁止中国所有中小学生携带手机上学。

9·The government provides free education at both primary and secondary school levels and provides some financial assistance for private schools.

政府为小学和中学都提供免费教育，并为私立学校提供一定的经济援助。

10·The main tasks of the reform are to unify title systems of primary and secondary school teachers and set up senior titles.

改革的主要任务是统一中小学教师职称制度，建立高级职称。