高中 + Noun
高中 (gāozhōng) is a noun meaning "high school" or "senior secondary school." It refers to the educational level typically covering ages 15–18 in the Chinese school system. It is often used as a modifier before other nouns, such as 高中生 (gāozhōng shēng, "high school student").
她是我高中时候最好的朋友。
Tā shì wǒ gāozhōng shíhou zuì hǎo de péngyou.
She was my best friend in high school.
弟弟今年刚考上一所不错的高中。
Dìdi jīnnián gāng kǎo shàng yī suǒ búcuò de gāozhōng.
My younger brother just got into a good high school this year.
高中三年的生活让我成长了很多。
Gāozhōng sān nián de shēnghuó ràng wǒ chéngzhǎng le hěn duō.
The three years of high school life helped me grow a lot.