1 to go to school

2 to attend school

1 middle school

2 classifier: 个 gè

1 to take good care of (or conserve) one's health

2 to keep in good repair

3 to maintain

4 maintenance

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

2 once bitten, twice shy

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

1 not ashamed to learn from subordinates (idiom)

1 debt nurtures more debt (idiom)

1 to cultivate the heart and nurture the character (idiom); to improve oneself by meditation