Bù jiànkāng de yǐnshí, jiǔ'érjiǔzhī huì sǔnhài shēntǐ.
An unhealthy diet will damage your body over time.
Tips
usage
Functions as a time adverbial, typically at the start of a clause, describing a gradual result that emerges after a long period of repetition or habituation. Interchangeable with 日久天长 in many contexts.
grammar
Structure: 久 (long) 而 (and) 久 (long) 之 (it). The reduplication of 久 stresses extended duration; 之 is a classical filler pronoun with no concrete meaning.