1 to go to school

2 to attend school

1 middle school

2 classifier: 个 gè

1 chemistry

2 chemical

1 to study at the same school

2 fellow student

3 classmate

4 classifier: 位 wèi

5 classifier: 个 gè

1 the Great Learning, one of the Four Books 四書|四书[Sì shū] in Confucianism

1 to take sth as a lesson for next time (idiom)

2 once bitten, twice shy

1 wastage makes one destitute (idiom)

1 without learning or skills (idiom); ignorant and incompetent

1 not ashamed to learn from subordinates (idiom)

1 frugality in order to prevent destitution (idiom)