Solar terms，also called Jieqi in Chinese，are 24 special days in the traditional Chinese calendar. （1）

known

known

（know）as "the fifth great invention" of China，solar terms show the Chinese wisdom of dividing time.
    Solar terms first（2）

appeared

appeared

（appear）over 2，500 years ago.The Yellow River Basin，is the cradle（搖藍(lán)）of them.（3）

originally

originally

（original），the region was China's major political，economic，cultural and agricultural center.Until the Western Han Dynasty，the 24 solar terms were well established.
    Created by farmers，24 solar terms（4）

are used

are used

（use）to guide farming in ancient China，（5）

which

which

indicate certain changes in seasons and climate.
    In ancient times，these solar terms allowed farms to know what conditions（6）

to be expected

to be expected

（expect）and what farming（7）

actively

actively

（active）to carry out during different period of a year.What's more，most of the solar terms have rich social and cultural meanings.For example，people eat pears on the Waking of Insects and dumplings on the Winter Solstice.Today，in the time of modern farming，traditional solar terms remain（8）

important

important

（importance）.They remind us that nature is changing（9）

for

for

its rate，and they reflect the relationship between humans and nature in（10）

the

the

understanding of Chinese people.