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。

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It might mean staying in the biggest cities but plumping for lower-quality assets, or moving into the best locations in secondary cities.

还可能意味着在大城市里选择质量较差的资产，或者进入二级城市的黄金地带。

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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