星期日是许多商家选择的会员日，在这一天，会员可以享受更多的优惠和折扣。这不仅是商家对会员的一种回馈，也是一种促销手段。许多人会在星期日选择购买他们需要的物品，以获得更多的实惠。

Sunday is the chosen day for many businesses to have Member Day, where members can enjoy more discounts and offers. This is not only a way for businesses to show appreciation to their members, but also a promotional tactic. Many people choose to shop on Sundays to get more bang for their buck.