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Open the tool →成日成夜 (chéng rì chéng yè) is a Chinese idiom (chengyu) meaning “all day and all night long”.
成日成夜 is pronounced chéng rì chéng yè in Mandarin Chinese.
Literally, 成日成夜 means “whole day whole night”. It is used to mean “all day and all night long”.
整天整夜,日日夜夜。