購買兩件或以上商品時，第二件起每件優惠￥5。例如：購買三件商品，每件為￥100，總價是￥290，即3*100-2*5。
在此基礎上，老客戶每個訂單優惠￥10。
For orders with multiple items, every items after the first receives a 5 CNY discount. For example: on purchasing 3 items, each priced at 100 CNY, the total price will be 290 CNY. (3*100-2*5)
Additionally, returning customers receive a 10 CNY discount per order.