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Open the tool →没日没夜 (méi rì méi yè) is a Chinese idiom (chengyu) meaning “to work or do something incessantly”.
没日没夜 is pronounced méi rì méi yè in Mandarin Chinese.
Literally, 没日没夜 means “no day, no night”. It is used to mean “to work or do something incessantly”.
犹言不分白天夜晚。