为自己加油

改进题：All services in business-such as gift wrapping,delivery,and credit-have some amount of costs associated with them, and these costs must be covered by higher prices.

译文：商业中的所有服务，如礼品包装、送货和信贷，都有一定的成本，这些成本必须由更高的价格来支付。

改进的译文：商业中所有的服务－诸如礼品包装、送货以及赊账－都有相应的成本，而这些成本要靠较高的价格来弥补。