The opportunity cost of apuppy includes not just the purchase price of the puppy, but also the food, veterinary bills, carpetcleaning, and the value of the time spent dealing withthe puppy.
养狗的机会成本不单单是买狗所花的费用，还包括狗粮、请兽医、清洁地毯，和花费在遛狗上的时间。
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The opportunity cost of apuppy includes not just the purchase price of the puppy, but also the food,veterinary bills, carpetcleaning, and the value of the time spent dealing withthe puppy.