好好學習，天天向上

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Pronunciation

Peng'im: ho2 ho2 hag8 sib8
POJ: hó-hó-ha̍k-si̍p
Variety: chaozhou

Peng'im: tiêng1 tiêng1 hiang3 siang6
POJ: thieng-thieng-hiàng-siǎng
Variety: chaozhou

idiom: study hard and improve every day, make progress daily through hard study
好好學習，天天向上

2 candidate readings from Wiktionary — genuine Chaozhou colloquial form not yet confirmed by a speaker.