1 to go to school

2 to attend school

1 middle school

2 classifier: 个 gè

1 ten million

2 countless

3 many

4 one must by all means

1 magnificent army with thousands of men and horses (idiom); impressive display of manpower

2 all the King's horses and all the King's men

1 to study at the same school

2 fellow student

3 classmate

4 classifier: 位 wèi

5 classifier: 个 gè

1 one man can hold the pass against ten thousand enemies (idiom)

1 small capital, huge profit (idiom); to put in a little and get a lot out

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)