「久病成醫」

(pos:語句)
<explanation>
yue:病耐咗，對醫理都熟咗
eng:to become familiar with medicine due to one's prolonged illness
<eg>
yue:佢做藥煲做咗十年有多，藥性、副作用知得一清二楚，已經久病成醫。 (keoi5 zou6 joek6 bou1 zou6 zo2 sap6 nin4 jau5 do1, joek6 sing3, fu3 zok3 jung6 zi1 dak1 jat1 cing1 ji6 co2, ji5 ging1 gau2 beng6 sing4 ji1.)
eng:Having been on medication for over ten years, he's become well-versed in its nature and side effects.