Zhè zhǒng shìqing duì tā lái shuō zǎo jiù sīkōngjiànguàn le.
This kind of thing is old hat to him.
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history
司空 was a high-ranking official title in ancient China. The idiom originates from a Tang Dynasty story where the poet 刘禹锡 (Liú Yǔxī) used it to describe a scene so common that even the 司空 was used to it.
