"Liquidity" can also be used as a noun, meaning the convenience of transportation or the transfer of funds, such as currency flow and population flow. Its synonyms include "circulation", "fluency" and "flexibility". In popular language, we can also change the word "flow" into other words to form different combinations, such as "circulation", "circulation" and "disclosure".
The wide application of "Liu" also makes it a word with philosophical and cultural connotations. In Buddhism, mobility is interpreted as "impermanence", that is, everything changes, with no beginning and no end. In poetry, people also like to use "flow" to describe the passage of time, the change of life or natural landscape, for example, "Time flies like water" and "The sunset is lonely in Qi Fei, and the autumn water is * * * the sky is one color". These poems all convey the feelings and understanding of this characteristic.