国中

junior high school, middle school

noun Rare #31,674
junior high school, middle school Common in Taiwan; in mainland China, 初中 is more commonly used.
CH: 我妹妹明年要上国中。
EN: My younger sister will start junior high school next year.

真羡慕你国中三年高中三年都有这么多人追你

I’m really jealous that you had so many people pursuing you throughout all three years of middle school and all three years of high school.

— 那些年,我们一起追的女孩 (2011)

你爸我也是国中开始喝酒

Your dad here started drinking in middle school too.

— 汉江怪物 (2006)

到了国中他就变成另外一个人

By the time he started middle school, he had become a different person.

— A Sun (2019)

其实高中跟国中差不了多少地狱十七层跟十六层的差别而已

Actually, high school isn't much different from middle school—it's like the difference between the seventeenth and sixteenth levels of hell.

— 那些年,我们一起追的女孩 (2011)