https://youtu.be/vMgbmLvHKE4?si=-EPWcvaBfT5sp0IV
省到水電:Bal b/f TW$28,105+TW$365=TW$28,470 Bal c/f
https://youtu.be/klWz6yeZQIo?si=KCRZJapkkdBTgB3i
https://youtu.be/cKtmrxYmF60?si=Ci37HkEmS9AQWQWx
https://digitalrepository.lib.hku.hk/catalog/2f75xg03r#?c=&m=&s=&cv=&xywh=-1646%2C-2069%2C4369%2C7169