Lower secondary education and upper secondary education lasts for three years each.

在挪威，初级教育为期7年，初中和高中教育各有三年。

youdao

The obligatory school system usually includes the primary education and secondary education I (lower secondary).

义务学校体系包括初级教育和中级教育i(较低的中级教育)。

youdao

According to the function, the wheat roots could be divided into 3 groups: primary root group, lower secondary root group and upper secondary root group.

依照各单位根的功能，小麦根可分为3组：初生根组、次生根下位组和次生根上位组。

youdao

This proportion rises to 49% and 44% respectively for upper and lower secondary education.

UNESCO: World Water Assessment Programme (WWAP)

Young people need good quality training in relevant foundation skills at lower secondary school.

UNESCO: One dollar invested in youth skills can pay back fifteen-fold in economic growth | United Nations Educational, Scientific and Cultural Organization

All young people need quality training in relevant foundation skills at lower secondary school.

UNESCO: One third of young people in Sub-Saharan Africa fail to complete primary school and lack skills for work | United Nations Educational, Scientific and Cultural Organization