The stream flows endlessly
This refers to a unending stream of objects (cars, people, etc)
Neutral
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This is an HSK chengyu
《千字文》(Qiān Zì Wén), an ancient poem used as an elementary school reading primer. One thousand distinct characters are used to form the poem, making this resource particularly helpful for those learning new characters. It is known in English as the "Thousand Character Classic"
This chengyu is from a line in the work listed in the "Origin" section above