The abacus is a traditional calculation tool in China. Does the abacus represent how many sticks are strung on a number?

4 1 1. Abacus is a traditional calculation tool in China. What's the name of the stick on the abacus? Calculate chips.

4 12. The abacus is a traditional calculation tool in China. Does the abacus use a number-seven to represent how many beads are strung on a wooden stick?

4 13. "July filariasis" means that the weather turns cold.

4 14. The general weather occurs in the troposphere.

4 15. How many seasons are there in the 24th lunar calendar in China?

4 16. How many of the 24 solar terms reflect the changes of the four seasons-eight?

4 17. The lunar calendar calls the first day of each month the new moon.

4 18. The traditional colored porcelain "Su Tricolor" is called "Su" because it is not red.

4 19. Who invented papermaking-Cai Lun?

420. The turtle in the conference refers to Wu Sangui.