The spring breeze in February is a scissorhands joke.

In class, the math teacher is explaining the multi-digit subtraction.

Teacher: Multi-digit subtraction, first align the upper and lower digits, then subtract the single digits from the single digits, and subtract the ten digits from the ten digits ... When the low digits are not enough, borrow from the high digits.

The students raised their hands and asked, Teacher, what should we do if the tall people refuse to lend money to the low people?